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INTRODUCTION -1
2- PROCESS
3- FINDING
4- CONCLUSION
5- RECOMMENDATIONS
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السلام عليكم ورحمه الله وبركاته
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والسموحه إذا في اي قصور
Dubai
Introduction
Dubai can either refer to one of the seven emirates that constitute the United Arab Emirates (UAE) in the eastern Arabian Peninsula, or that emirate’s main city, sometimes called "Dubai city" to distinguish it from the emirate.`The modern emirate of Dubai was created with the formation of the United Arab Emirates in 1971. However, written accounts ********ing the existence of the city have existed at least 150 years prior to the formation of the UAE. Dubai shares legal, political, military and economic functions with the other emirates within a federal framework, although each emirate has jurisdiction over some functions such as civic law enforcement and provision and upkeep of local facilities. Dubai has the largest population and is the second largest emirate by area, after Abu Dhabi. With Abu Dhabi, it is one of only two emirates to possess veto power over critical matters of national importance in the UAE. Dubai has been ruled by the Al Maktoum dynasty since 1833. The emirates’ current ruler, Mohammed bin Rashid Al Maktoum, is also the Prime Minister and Vice President of the UAE.
History
Very little is known about pre-Islamic culture in the south-east Arabian peninsula, except that many ancient towns in the area were trading centers between the Eastern and Western worlds. The remnants of an ancient mangrove swamp, dated at 7,000 years, were discovered during the construction of sewer lines near Dubai Internet City. The area had been covered with sand about 5,000 years ago as the coastline retreated inland, becoming a part of the city’s present coastline. Prior to Islam, the people in this region worshiped Bajir. The Byzantine and Sassanian empires constituted the great powers of the period, with the Sassanians controlling much of the region. After the spread of Islam in the region, the Umayyad Caliph, of the eastern Islamic world, invaded south-east Arabia and drove out the Sassanians. Excavations undertaken by the Dubai Museum in the region of Al-Jumayra (Jumeirah) indicate the existence of several artifacts from the Umayyad period. The earliest recorded mention of Dubai is in 1095, in the "Book of Geography" by the Spanish-Arab geographer Abu Abdullah al-Bakri. The Venetian pearl merchant Gaspero Balbi visited the area in 1580 and mentioned Dubai (Dibei) for its pearling industry. ********ed records of the town of Dubai exist only after 1799. Two catastrophes struck the town during the mid 1800s. First, in 1841, a smallpox epidemic broke out in the Bur Dubai locality, forcing residents to relocate east to Deira. Then, in 1894, fire swept through Deira, burning down most homes. However, the town’s geographical ******** continued to attract traders and merchants from around the region. The emir of Dubai was keen to attract foreign traders and lowered trade tax brackets, which lured traders away from Sharjah and Bandar Lengeh, which were the region’s main trade hubs at the time. On 2 December 1971 Dubai, together with Abu Dhabi and five other emirates, formed the United Arab Emirates after former protector Britain left the Persian Gulf in 1971. In 1973, Dubai joined the other emirates to adopt a uniform currency: the UAE dirham. In the 1970s, Dubai continued to grow from revenues generated from oil and trade, even as the city saw an influx of Lebanese immigrants fleeing the civil war in Lebanon. The Jebel Ali Free Zone, comprising the Jebel Ali port (reputedly the world’s largest man made port) was established in 1979, which provided foreign companies unrestricted import of labour and export capital.Historically, Dubai and its twin across the Dubai creek, Deira (independent of Dubai City at that time), became important ports of call for Western manufacturers. Most of the new city’s banking and financial centres were headquartered in the port area. Dubai maintained its importance as a trade route through the 1970s and 1980s. The city of Dubai has a free trade in gold and until the 1990s was the hub of a "brisk smuggling trade" of gold ingots to India, where gold import was restricted.
Geography
Dubai’s geographical proximity to India made it an important ********. The town of Dubai was an important port of call for foreign tradesmen, chiefly those from India, many of whom eventually settled in the town. Dubai was known for its pearl exports until the 1930s. However, Dubai’s pearling industry was damaged irreparably by the events of the First World War, and later on by the Great Depression in the late 1920s. Consequently, the city witnessed a mass migration of people to other parts of the Persian Gulf.
Population
Dubai’s population hit 1,241,000 (one million two hundred forty one thousand) as on 30 June 2022. Of the total population, 73 per cent or 911,000 are male and 27 per cent or 330,000 are female.
********
Dubai is situated on the Persian Gulf coast of the United Arab Emirates and is roughly at sea level (16 m/52 ft above). The emirate of Dubai shares borders with Abu Dhabi in the south, Sharjah in the northeast, and the Sultanate of Oman in the southeast. Hatta, a minor exclave of the emirate, is surrounded on three sides by Oman and by the emirates of Ajman (in the west) and Ras Al Khaimah (in the north). The Persian Gulf borders the western coast of the emirate. The sandy desert surrounding the city supports wild grasses and occasional date palm trees. Desert hyacinths grow in the sabkha plans east of the city, while acacia and ghaf trees grow in the flat plains within the proximity of the Western Al Hajar mountains. Several indigenous trees such as the date palm and neem as well as imported trees like the eucalypts grow in Dubai’s natural parks. The houbara bustard, striped hyena, caracal, desert fox, falcon and Arabian oryx are common in Dubai’s desert. Dubai is on the migration path between Europe, Asia and Africa, and more than 320 migratory birds pass through the emirate in spring and autumn. The waters of Dubai are home to more than 300 species of fish, including the hammour. Dubai Creek runs northeast-southwest through the city. The eastern section of the city forms the locality of Deira and is flanked by the emirate of Sharjah in the east and the town of Al Aweer in the south. The Dubai International Airport is located south of Deira, while the Palm Deira is located north of Deira in the Persian Gulf. The western section forms the locality of Bur Dubai. Much of Dubai’s real estate boom has been concentrated to the west of this region, on the Jumeirah coastal belt and along Sheikh Zayed Road . Port Rashid, Jebel Ali, Burj Al Arab, the Palm Jumeirah and theme based free zone clusters such as Business Bay are all located in this section. Sheikh Zayed Road and Emirates Road are the main arteries of Dubai; and run roughly parallel to each other in the western section of the city, before eventually diverging sharply near Jumeirah. The eastern and western sections of the city are connected by Al Maktoum Bridge, Al Garhoud Bridge, Al Shindagha Tunnel, Business Bay Crossing and Floating Bridge.
Climate
Dubai has a hot and, at times, humid climate with many months recording temperatures of over 40 °C (104 °F) (refer to accompanying table for recorded mean minimum and maximum temperatures during the year). Rainfall is generally light, with a mean of about 150 millimetres (6 in) per year; precipitation is usually centered around January, February and March. However, heavy rain is not uncommon in Dubai during the winter months and January 2022 saw a record of 120mm (or 5") of rain falling in just 24 hours, The mean humidity in Dubai is about 60%.Although Arabic is the official language of Dubai, Persian, Malayalam, English, Hindi, Urdu, Bengali, Tamil, and Tagalog are widely spoken. Article 7 of the UAE’s Provisional Constitution declares Islam the official state religion of the UAE. The government subsidizes almost 95 percent of mosques and employs all imams; approximately 5 percent of mosques are entirely private, and several large mosques have large private endowments.Dubai has large expatriate Hindu, Sikh, and Christian communities. Non-Muslim groups can own their own houses of worship, where they can practice their religion freely, by requesting a land grant and permission to build a compound. Groups that do not have their own buildings must use the facilities of other religious organizations or worship in private homes. Non-Muslim religious groups are permitted to openly advertise group functions; however, proselytizing or distributing religious literature is strictly prohibited under penalty of criminal prosecution, imprisonment, and deportation for engaging in behavior offensive to Islam.
Economy
Dubai is considered to be an important tourist destination and its port, Jebel Ali, constructed in the 1970s, has the largest man-made harbor in the world. Dubai is also increasingly developing as a hub for service industries such as IT and finance, with the establishment of a new Dubai International Financial Centre (DIFC). The government has set up industry-specific free zones throughout the city. Dubai Internet City, combined with Dubai Media City as part of TECOM (Dubai Technology, Electronic Commerce and Media Free Zone Authority) is one such enclave whose members include IT firms such as EMC Corporation, Oracle Corporation, Microsoft, and IBM, and media organisations such as MBC, CNN, Reuters and AP.
The Dubai Financial Market (DFM) was established in March 2022 as a secondary market for trading securities and bonds, both local and foreign. As of Q4 2022, its trading volume stood at about 400 billion shares worth US$ 95 billion. The DFM had a market capitalization of about US$ 87 billion.
The government’s decision to diversify from a trade-based, but oil-reliant, economy to one that is service and tourism-oriented has made real estate more valuable, resulting in the property appreciation from 2022–2017. Large scale real estate development projects have led to the construction of some of the tallest skyscrapers and largest projects in the world such as the Emirates Towers, the Palm Islands and the world’s tallest, and most expensive, hotel the Burj Al Arab. As of July 2022, the Burj Dubai became the world’s tallest structure and is expected to be taller by several hundred feet, once construction is complete. Construction should finish in late 2022 and the building occupied by September of 2022. There will be an estimated 164 floors, the top floor at 624.1 meters, or 2,058 feet. Including the antennae and spire the total height of the Burj Dubai will be an estimated 818 meters, or 2,684 feet. Dubai has approximately 250,000, mostly South Asian laborers working on real estate development projects such as the Dubai Marina.The main road that connects one side of Dubai with the other is Sheikh Zayed Road. In July 2022, Salik road toll collection points were installed on the Sheikh Zayed road and on Al Garhoud bridge, which emphasizes the system’s congestion management objectives as well as the choice of technology for the toll system. The new system utilizes the latest technology to achieve free flow operation with no toll booths, no toll collectors, and no impact to traffic flow, allowing vehicles to move freely through the tolling point at highway speeds. Each time one passes through a Salik tolling point, the toll of AED 4 will be deducted from her or his prepaid toll account using Radio Frequency Identification (RFID) technology.
Transportation
Dubai International Airport , the hub for Emirates Airline, services the city of Dubai and other emirates in the country. The airport served a total of over 34 million passengers and over 260,000 flights in 2022. The Dubai International Airport ranked 17th among international airports for total cargo traffic in 2022. A third terminal and a new concourse are currently under construction and are both due to open in mid-2017. The new terminal will be dedicated to Emirates Airline and will fully support the new Airbus A380. The development of Dubai World Central International Airport, currently under construction in Jebel Ali, was announced in 2022. The first phase is expected to be completed by 2022, and once operational the new airport will host foreign airlines. Emirates (both the passenger and cargo operations) will remain in Dubai International Airport. Dubai has a large bus system that services 69 routes and transported over about 90 million people in 2022. The Road and Transport Authority (RTA) announced in 2022 that an additional 620 new buses will be added to its fleet of 170 double decker buses. Although the main mode of transportation in Dubai is by private vehicle, Dubai also has an extensive taxi system.
A $3.89 billion Dubai Metro project is under construction for the emirate. The Metro system is expected to be partially operational by 2022 and fully operational by 2022. The metro will comprise two lines: the Green Line from Rashidiya to the main city center and the Red Line from the airport to Jebel Ali. The Dubai Metro (Green and Blue Lines) will have 70 kilometers of track and 43 stations, 33 above ground and ten underground. One of the more traditional methods of getting across Bur Dubai to Deira is through abras, small boats that ferry passengers across the Dubai Creek, between abra stations in Bastakiya and Bani Yas road.
Education
The school system in Dubai does not differ from that of the United Arab Emirates. As of 2022, there are 88 public schools run by the Ministry of Education that serve Emiratis and expatriate Arabs as well as 132 private schools. The medium of instruction in public schools is Arabic with emphasis on English as a second language, while most of the private schools use English as their medium of instruction. Most private schools cater to one or more expatriate communities. Delhi Private School, Our Own English High School, the Dubai Modern High School, and the Indian High School, Dubai offer either a CBSE or an ICSE Indian syllabus. Similarly, there are also several reputable Pakistani schools offering FBISE curriculum for expatriate children. Dubai English Speaking School, Jumeirah Primary School, Jebel Ali Primary School, the Cambridge High School (or Cambridge International School), Jumeirah English Speaking School, King’s School and the Horizon School all offer British primary education up to the age of eleven. Dubai British School, Dubai College, English College Dubai, Jumeirah College and St. Mary’s Catholic High School are all British eleven-to-eighteen secondary schools which offer GCSE and A-Levels. Emirates International School provides full student education up to the age of 18, this is an International school and offers IGCSE and the IB program. Wellington International School, which caters education from 4-18, offers IGCSE and A-Levels. Deira International School also offers the IB program including the IGCSE program.The Ministry of Education of the United Arab Emirates is responsible for school’s accreditation. The Dubai Education Council was established in July 2022 to develop the education sector in Dubai. The Knowledge and Human Development Authority (KHDA) was established in 2022 to develop education and human resource sectors in Dubai, and license educational institutes. Approximately 10% of the population has university or postgraduate degrees. Many expatriates tend to send their children back to their home country or to Western countries for university education and even to India for technology studies. However, a sizable number of foreign accredited universities have been set up in the city over the last ten years. Some of these universities include the Birla Institute of Technology and Science, Pilani (BITS Pilani), American University in Dubai (AUD), the American College of Dubai, SP Jain Center Of Management,University of Wollongong in Dubai and Institute of Management Technology, Dubai. In 2022, the Dubai School of Government in collaboration with Harvard University’s John F. Kennedy School of Government and Harvard Medical School Dubai Center (HMSDC) were established in Dubai.Admission to any of these schools is based on the institution’s respective policies. They differ in deadlines of submission of applications, admission procedures and tuition and matriculation fees. It is best to contact the school or institution to inquire about its own procedures.
RESOURCES
* en.wikipedia.org/wiki/Dubai
* links.jstor.org *propertyfrontiers.com/pdfs/dubaireport.pdf
C:- Choose the suitable words :-
1- He is a farmer he work for …………………
a) transport b) agriculture c) bank
2- My uncle is pilot he works for ……………..
a) government b) typist c) transport
3- My elder brother work in …………… Section he
an accountant .
a) finance b) doctor c) sector
4- She works in the leisure industry she is a …………… in a hotel .
a) typist b) receptionist c) student
5- She is a ……….. she works in an office she helps the manager and types the letters .
a) manufacturing b) doctors c) typist
6- I would like to be a ………… when I leave school , because I like to help sick people .
a) doctor b) teacher c) student
D:- Choose the best answer :-
1- I would ………… a well paid job .
a) likes b) like c) liked
2- I learnt ……….. in coin was shout in 1865 .
a) of b) about c) that
3- He ……….. study hard for the exam .
a) shoulds b) should c) should to
4- I don’t …………. To work in side .
a) want b) do like c) wants
5- This job is …………. Than my last one .
a) good b) better c) gooder
6- He is a ………… manager than her .
a) bad b) worse c) bader
7- What is ………… name ? hamad
a) his b) him c) her
8- I learn …………. Money than him .
a) little b) least c) less
E:- Write a paragraph about " work and business " using the following words to help you :-
( sectors – public – private – government – oil industry – finance – agriculture – manufacturing – retail – transport)
………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ………………………………………………………………… ……………
The end
Definitions
Main article: acid-base reaction theories
The word "acid" comes from the Latin acidus meaning "sour," but in chemistry the term acid has a more specific meaning. There are four common ways to define an acid:
Arrhenius: According to this definition developed by the Swedish chemist Svante Arrhenius, an acid is a substance that increases the concentration of hydrogen ions (H+), which are carried as hydronium ions (H3O+) when dissolved in water, while bases are substances that increase the concentration of hydroxide ions (OH-). This definition limits acids and bases to substances that can dissolve in water. Around 1800, many French chemists, including Antoine Lavoisier, incorrectly believed that all acids contained oxygen. Indeed the modern German word for oxygen is Sauerstoff (lit. sour substance), as is the Afrikaans word for oxygen suurstof, with the same meaning. English chemists, including Sir Humphry Davy at the same time believed all acids contained hydrogen. Arrhenius used this belief to develop this definition of acid.
Brønsted-Lowry: According to this definition, an acid is a proton (hydrogen nucleus) donor and a base is a proton acceptor. The acid is said to be dissociated after the proton is donated. An acid and the corresponding base are referred to as conjugate acid-base pairs. Brønsted and Lowry independently formulated this definition, which includes water-insoluble substances not in the Arrhenius definition.
solvent-system definition: According to this definition, an acid is a substance that, when dissolved in an autodissociating solvent, increases the concentration of the solvonium cations, such as H3O+ in water, NH4+ in liquid ammonia, NO+ in liquid N2O4, SbCl2+ in SbCl3, etc. Base is defined as the substance that increases the concentration of the solvate anions, respectively OH-, NH2-, NO3-, or SbCl4-. This definition extends acid-base reactions to non-aqueous systems and even some aprotic systems, where no hydrogen nuclei are involved in the reactions. This definition is not absolute, a compound acting as acid in one solvent may act as a base in another.
Lewis: According to this definition developed by Gilbert N. Lewis, an acid is an electron-pair acceptor and a base is an electron-pair donor. (These are frequently referred to as "Lewis acids" and "Lewis bases," and are electrophiles and nucleophiles, respectively, in organic chemistry; Lewis bases are also ligands in coordination chemistry.) Lewis acids include substances with no transferable protons (ie H+ hydrogen ions), such as iron(III) chloride, and hence the Lewis definition of an acid has wider application than the Brønsted-Lowry definition. In fact, the term Lewis acid is often used to exclude protic (Brønsted-Lowry) acids. The Lewis definition can also be explained with molecular orbital theory. In general, an acid can receive an electron pair in its lowest unoccupied orbital (LUMO) from the highest occupied orbital (HOMO) of a base. That is, the HOMO from the base and the LUMO from the acid combine to a bonding molecular orbital.
Although not the most general theory, the Brønsted-Lowry definition is the most widely used definition. The strength of an acid may be understood by this definition by the stability of hydronium and the solvated conjugate base upon dissociation. Increasing or decreasing stability of the conjugate base will increase or decrease the acidity of a compound. This concept of acidity is used frequently for organic acids such as carboxylic acid. The molecular orbital description, where the unfilled proton orbital overlaps with a lone pair, is connected to the Lewis definition.
Properties
Bronsted-Lowry acids:
Are generally sour in taste
Strong or concentrated acids often produce a stinging feeling on mucous membranes
React to indicators as follows: turn blue litmus and methyl orange red, do not change the color of phenolphthalein
Will react with ****ls to produce a ****l salt and hydrogen
Will react with ****l carbonates to produce water, CO2 and a salt
Will react with a base to produce a salt and water
Will react with a ****l oxide to produce water and a salt
Will conduct electricity, depending on the degree of dissociation
Will produce solvonium ions, such as hydronium (H3O+) ions in water
Will denature proteins
Strong acids and many concentrated acids are dangerous, causing severe burns for even minor contact. Acids are corrosive. Generally, acid burns are treated by rinsing the affected area abundantly with running water (15 minutes) and followed up with immediate medical attention. In the case of highly concentrated acids, the acid should first be wiped off as much as possible, otherwise the exothermic mixing of the acid and the water could cause severe thermal burns. Acids may also be dangerous for reasons not related to their acidity, see an appropriate MSDS for more detailed information.
Nomenclature
In the classical naming system, acids are named according to their anions. That ionic suffix is dropped and replaced with a new suffix (and sometimes prefix), according to the table below. For example, HCl has chloride as its anion, so the -ide suffix makes it take the form hydrochloric acid. In the IUPAC naming system, "aqueous" is simply added to the name of the ionic compound. Thus, for hydrogen chloride, the IUPAC name would be aqueous hydrogen chloride.
Classical naming system:
Anion Prefix Anion Suffix Acid Prefix Acid Suffix Example
per ate per ic acid perchloric acid (HClO4)
ate ic acid chloric acid (HClO3)
ite ous acid chlorous acid (HClO2)
hypo ite hypo ous acid hypochlorous acid (HClO)
ide hydro ic acid hydrochloric acid (HCl)
Chemical characteristics
In water the following equilibrium occurs between a weak acid (HA) and water, which acts as a base:
HA(aq) + H2O ⇌ H3O+(aq) + A-(aq)
The acidity constant (or acid dissociation constant) is the equilibrium constant for the reaction of HA with water:
Strong acids have large Ka values (i.e. the reaction equilibrium lies far to the right; the acid is almost completely dissociated to H3O+ and A-). Strong acids include the heavier hydrohalic acids: hydrochloric acid (HCl), hydrobromic acid (HBr), and hydroiodic acid (HI). (However, hydrofluoric acid, HF, is relatively weak.) For example, the Ka value for hydrochloric acid (HCl) is 107.
Weak acids have small Ka values (i.e. at equilibrium significant amounts of HA and A− exist together in solution; modest levels of H3O+ are present; the acid is only partially dissociated). For example, the Ka value for acetic acid is 1.8 x 10-5. Most organic acids are weak acids. Oxoacids, which tend to contain central atoms in high oxidation states surrounded by oxygen may be quite strong or weak. Nitric acid, sulfuric acid, and perchloric acid are all strong acids, whereas nitrous acid, sulfurous acid and hypochlorous acid are all weak.
Note on terms used:
The terms "hydrogen ion" and "proton" are used interchangeably; both refer to H+.
In aqueous solution, the water is protonated to form hydronium ion, H3O+(aq). This is often abbreviated as H+(aq) even though the symbol is not chemically correct.
The strength of an acid is measured by its acid dissociation constant (Ka) or *****alently its pKa (pKa= – log(Ka)).
The pH of a solution is a measurement of the concentration of hydronium. This will depend on the concentration and nature of acids and bases in solution.
Polyprotic acids
Polyprotic acids are able to donate more than one proton per acid molecule, in contrast to monoprotic acids that only donate one proton per molecule. Specific types of polyprotic acids have more specific names, such as diprotic acid (two potential protons to donate) and triprotic acid (three potential protons to donate).
A monoprotic acid can undergo one dissociation (sometimes called ionization) as follows and simply has one acid dissociation constant as shown below:
HA(aq) + H2O(l) ⇌ H3O+(aq) + A−(aq) Ka
A diprotic acid (here symbolized by H2A) can undergo one or two dissociations depending on the pH. Each dissociation has its own dissociation constant, Ka1 and Ka2.
H2A(aq) + H2O(l) ⇌ H3O+(aq) + HA−(aq) Ka1
HA−(aq) + H2O(l) ⇌ H3O+(aq) + A2−(aq) Ka2
The first dissociation constant is typically greater than the second; i.e., Ka1 > Ka2 . For example, sulfuric acid (H2SO4) can donate one proton to form the bisulfate anion (HSO4−), for which Ka1 is very large; then it can donate a second proton to form the sulfate anion (SO42−), wherein the Ka2 is intermediate strength. The large Ka1 for the first dissociation makes sulfuric a strong acid. In a similar manner, the weak unstable carbonic acid (H2CO3) can lose one proton to form bicarbonate anion (HCO3−) and lose a second to form carbonate anion (CO32−). Both Ka values are small, but Ka1 > Ka2 .
A triprotic acid (H3A) can undergo one, two, or three dissociations and has three dissociation constants, where Ka1 > Ka2 > Ka3 .
H3A(aq) + H2O(l) ⇌ H3O+(aq) + H2A−(aq) Ka1
H2A−(aq) + H2O(l) ⇌ H3O+(aq) + HA2−(aq) Ka2
HA2−(aq) + H2O(l) ⇌ H3O+(aq) + A3−(aq) Ka3
An inorganic example of a triprotic acid is orthophosphoric acid (H3PO4), usually just called phosphoric acid. All three protons can be successively lost to yield H2PO4−, then HPO42−, and finally PO43− , the orthophosphate ion, usually just called phosphate. An organic example of a triprotic acid is citric acid, which can successively lose three protons to finally form the citrate ion. Even though the positions of the protons on the original molecule may be *****alent, the successive Ka values will differ since it is energetically less favorable to lose a proton if the conjugate base is more negatively charged.
Neutralization
Neutralization is the reaction between an acid and a base, producing a salt and water; for example, hydrochloric acid and sodium hydroxide form sodium chloride and water:
HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
Neutralization is the basis of titration, where a pH indicator shows *****alence point when the *****alent number of moles of a base have been added to an acid. It is often wrongly assumed that neutralization should result in a solution with pH 7.0, which is only the case with similar acid and base strengths during a reaction.
Neutralization with a base weaker than the acid results in a weakly acidic salt. An example is the weakly acidic ammonium chloride, which is produced from the strong acid hydrogen chloride and the weak base ammonia. Conversely, neutralizing a weak acid with a strong base gives a weakly basic salt, e.g. sodium fluoride from hydrogen fluoride and sodium hydroxide.
Weak acid/weak base equilibria
Main article: Henderson-Hasselbalch equation
In order to lose a proton, it is necessary that the pH of the system rise above the pKa of the protonated acid. The decreased concentration of H+ in that basic solution shifts the equilibrium towards the conjugate base form (the deprotonated form of the acid). In lower-pH (more acidic) solutions, there is a high enough H+ concentration in the solution to cause the acid to remain in its protonated form, or to protonate its conjugate base (the deprotonated form).
Solutions of weak acids and salts of their conjugate bases form buffer solutions.
Applications of acids
There are numerous uses for acids. Acids are often used to remove rust and other corrosion from ****ls in a process known as pickling. They may be used as an electrolyte in a wet cell battery, such as sulfuric acid in a car battery. In humans and many other animals, hydrochloric acid is a part of the gastric acid secreted within the stomach to help hydrolyze proteins and polysaccharides, as well as converting the inactive pro-enzyme, pepsinogen into the enzyme, pepsin. Acids are used as catalysts; for example, sulfuric acid is used in very large quantities in the alkylation process to produce gasoline.
Common acids
Citric Acid
Mineral acids
Solutions of hydrogen halides, such as hydrochloric acid (HCl) and hydrobromic acid (HBr)
Sulfuric acid (H2SO4)
Nitric acid (HNO3)
Phosphoric acid (H3PO4)
Chromic acid (H2CrO4)
Sulfonic acids
Methanesulfonic acid (aka mesylic acid) (MeSO3H)
Ethanesulfonic acid (aka esylic acid) (EtSO3H)
Benzenesulfonic acid (aka besylic acid) (PhSO3H)
Toluenesulfonic acid (aka tosylic acid, or (C6H4(CH3) (SO3H))
Carboxylic acids
Formic acid
Acetic acid
References
Listing of strengths of common acids and bases
Zumdahl, Chemistry, 4th Edition.
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