what is an acid?

Answer 1

Acid is traditionally considered any chemical compound that when dissolved in water, gives a solution with a pH of less than 7.

Answer 2

Usually a liquid with a pH of 6.9 or lower (like vinegar.) The opposite would be a base with a pH of 7.1 or higher (like bleach.)

Answer 3

What I use to trip on in the late 70's?

Answer 4

a solution having a pH less than 7.0

Answer 5

An acid (often represented by the generic formula HA) is traditionally considered any chemical compound that when dissolved in water, gives a solution with a pH of less than 7. That approximates the modern definition of Brønsted and Lowry, who defined an acid as a compound which donates a hydrogen ion (H+) to another compound (called a base). Common examples include acetic acid (in vinegar) and sulfuric acid (used in car batteries).

Definitions of acids and bases
The word "acid" comes from the Latin acidus meaning "sour," but in chemistry the term acid has a more specific meaning. There are three common ways to define an acid, namely, the Arrhenius, the Brønsted-Lowry and the Lewis definitions, in order of increasing generality.

Arrhenius: According to this definition, an acid is a substance that increases the concentration of hydronium ion (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). English chemists, including Sir Humphry Davy at the same time believed all acids contained hydrogen. The Swedish chemist Svante Arrhenius used this belief to develop this definition of acid.
Brønsted-Lowry: According to this definition, an acid is a proton 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 formulated this definition, which includes water-insoluble substances not in the Arrhenius definition.
Lewis: According to this definition, 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 transferrable 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. 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. This definition was developed by Gilbert N. Lewis.
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 stability of the conjugate base will increase 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.

Solutions of weak acids and salts of their conjugate bases form buffer solutions.

Acid/base systems are different from redox reactions in that there is no change in oxidation state.

Generally, acids have the following chemical and physical properties:

Taste: Acids generally are sour when dissolved in water.
Touch: Acids produce a stinging feeling, particularly strong acids.
Reactivity: Acids react aggressively with or corrode most metals.
Electrical conductivity: Acids, while not normally ionic, are electrolytes.
Strong acids and most concentrated acids are dangerous, causing severe burns for even minor contact. Generally, acid burns are treated by rinsing the affected area abundantly with water and followed up with immediate medical attention.

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Nomenclature
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.

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)
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Chemical characteristics
In water the following equilibrium occurs between an acid (HA) and water, which acts as a base:

HA(aq) ⇌ 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 equivalently its pKa (pKa= - log(Ka)).
The pH of a solution is a measurement of the concentration of hydronium. This will depend of the concentration and nature of acids and bases in solution.
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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 above:

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 equivalent, the successive Ka values will differ since it is energetically less favorable to lose a proton if the conjugate base is more negatively charged.

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Neutralization
Neutralization is the reaction between equal amounts of 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 equivalence point when the equivalent number of moles of a base have been added to an acid.

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Common acids
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Strong inorganic acids
Hydrobromic acid
Hydrochloric acid
Hydroiodic acid
Nitric acid
Sulfuric acid (first proton only)
Perchloric acid
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Medium to weak inorganic acids
Boric acid
Carbonic acid
Chloric acid
Hydrofluoric acid
Phosphoric acid
Pyrophosphoric acid
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Weak organic acids
Acetic acid
Benzoic acid
Butyric acid
Citric acid
Formic acid
Lactic acid
Malic acid
Mandelic acid
Methanethiol
Oxalic acid
Propionic acid
Pyruvic acid
Valeric acid
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More Common Acids
Acetic acid: (E260) found in vinegar
Adipic acid: (E355)
Alginic acid: (E400)
Ascorbic acid (vitamin C): (E300) found in fruits
Benzoic acid: (E210)
Boric acid: (E284)
Carbonic acid: (E290) found in carbonated soft drinks
Carminic acid: (E120)
Citric acid: (E330) found in citrus fruits
Cyclamic acid: (E952)
Erythorbic acid: (E315)
Erythorbin acid: (E317)
Formic acid: (E236) found in bee and ant stings
Fumaric acid: (E297)
Gluconic acid: (E574)
Glutamic acid: (E620)
Guanylic acid: (E626)
Hydrochloric acid: (E507) also known as Muriatic Acid
Inosinic acid: (E630)
Lactic acid: (E270) found in dairy products such as yoghurt and sour milk, also is product of cellular fermentation, the reason muscles burn
Malic acid: (E296)
Metatartaric acid: (E353)
Niacin (nicotinic acid): (E375)
Oxalic acid: found in spinach and rhubarb
Pectic acid: found in fruits and some vegetables
Phosphoric acid: (E338)
Propionic acid: (E280)
Sorbic acid: (E200) found in foods and drinks
Stearic acid: (E570), a type of fatty acid.
Succinic acid: (E363)
Sulfuric acid: (E513)
Tannic acid: found in tea
Tartaric acid: (E334) found in grapes
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Sources
Listing of strengths of common acids and bases
Zumdahl, Chemistry, 4th Edition.
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Acidification
This section is a stub. You can help by adding to it.
Acidification is the process whereby air pollution – mainly ammonia, sulphur dioxide and nitrogen oxides – is converted into acid substances.

This ‘acid rain’ is best known for the damage it causes to forests and lakes. Less well known are the many ways it damages freshwater and coastal ecosystems, soils and even ancient historical monuments, or the heavy metals these acids help release into groundwater.

Sulphur dioxide and the nitrogen oxides are mainly emitted by burning fossil fuels. As some of the reports in this section show,[citation needed] the 1990s saw these emissions drop substantially, thanks to a combination of European Directives forcing the installation of desulphurisation systems, the move away from coal as a fossil fuel, and major economic restructuring in the new German Lander.

Acidification is nevertheless still a major environmental problem in Europe. It is a cross-border issue, requiring coordinated initiatives across countries and sectors. This section brings together the EEA’s reports on the scale of the problem and the effectiveness of the solutions tried to date.