Acid salt

Acid salt

Acid salts are a class of salts formed when a dibasic or tribasic acid has been neutralized to some degree. Because the acid is only partially neutralized, one or more replaceable protons remain. Typically this will lead to a formula with one or more metal ions, one or more protons, and an anion, such as sodium bicarbonate (NaHCO3), sodium hydrosulfide (NaHS), sodium bisulfate (NaHSO4), monosodium phosphate (NaH2PO4), and disodium phosphate (Na2HPO4).

For example, in preparing sodium sulfate (Na2SO4) a certain amount of sodium hydroxide (NaOH) is needed to neutralize the sulfuric acid (H2SO4) to produce this salt. When preparing sodium bisulfate (NaHSO4), half of the required amount of sodium hydroxide for neutralization is used.

Such compounds can act either as an acid or a base: addition of an acid will restore protons, and addition of a base will consume protons. The actual pH of a solution of an acid salt will depend on the equilibrium constants involved, and whether the anion is a better proton donor or proton acceptor. A comparison between the "K"b and "K"a will indicate this: if "K"b > "K"a, the solution will be basic, whereas if "K"b < "K"a, the solution will be acidic.

Use in food

Some acid salts are used in baking. They are found in baking powders and are typically divided into low-temperature (or single-acting) and high-temperature (or double-acting) acid salts. Common low-temperature acid salts react at room temperature to produce a leavening effect. They include cream of tartar, calcium phosphate, and citrates. High-temperature acid salts produce a leavening effect during baking and are usually aluminium salts such as calcium aluminium phosphate. Some acid salts may also be found in non-dairy coffee creamers.

ee also

* alkali salt

References


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Look at other dictionaries:

  • Acid salt — Salt Salt, n. [AS. sealt; akin to OS. & OFries. salt, D. zout, G. salz, Icel., Sw., & Dan. salt, L. sal, Gr. ?, Russ. sole, Ir. & Gael. salann, W. halen, of unknown origin. Cf. {Sal}, {Salad}, {Salary}, {Saline}, {Sauce}, {Sausage}.] 1. The… …   The Collaborative International Dictionary of English

  • acid salt — Chem. a salt of a polybasic acid that is only partially neutralized by a base; a salt that is also an acid. [1720 30] * * * ˌacid ˈsalt 7 [acid salt] noun (chemistry) a salt formed when the ↑hydrogen of an acid is not completely replaced …   Useful english dictionary

  • acid salt — rūgščioji druska statusas T sritis chemija apibrėžtis Druska, turinti vandenilio katijonų. atitikmenys: angl. acid salt; hydrosalt rus. гидросоль; кислая соль …   Chemijos terminų aiškinamasis žodynas

  • acid salt — rūgščioji druska statusas T sritis chemija apibrėžtis Buitinis vyno rūgšties pavadinimas. atitikmenys: angl. acid salt rus. кислая соль …   Chemijos terminų aiškinamasis žodynas

  • acid salt — Chem. a salt of a polybasic acid that is only partially neutralized by a base; a salt that is also an acid. [1720 30] * * * …   Universalium

  • acid salt — any salt in which the combining power of the acid is not completely exhausted. Cf. persalt …   Medical dictionary

  • acid salt — chloride of sodium; salt that is an acid as well …   English contemporary dictionary

  • acid salt — noun Chemistry a salt formed by incomplete replacement of the hydrogen of an acid, e.g. potassium hydrogen sulphate (KHSO4) …   English new terms dictionary

  • Acid salt — Кислая соль …   Краткий толковый словарь по полиграфии

  • Salt — Salt, n. [AS. sealt; akin to OS. & OFries. salt, D. zout, G. salz, Icel., Sw., & Dan. salt, L. sal, Gr. ?, Russ. sole, Ir. & Gael. salann, W. halen, of unknown origin. Cf. {Sal}, {Salad}, {Salary}, {Saline}, {Sauce}, {Sausage}.] 1. The chloride… …   The Collaborative International Dictionary of English

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