Double salt

Double salt

Double salts are salts containing more than one cation or anion. They form when more than one salt is dissolved in a liquid and when together they crystallize in a regular pattern. A well-known double salt is alum containing two cations (potassium and aluminium) and a sulfate anion. Other examples are potassium sodium tartrate and bromlite.

Alums are double sulphates of a monovalent cation and a trivalent cation containing 24 water of crystallization.

Difference between a double salt and a complex... Double salts when dissolved in water dissociate into simple ions completely while complexes do not dissociate into simple ions and maintain the property of complexes.

"A double salt is a substance obtained by the combination of two different salts which crystallise together as a single substance but ionize as two distinct salts when dissolved in water."

When a double salt is formed by the chemical combination of two single salts (like, potassium tartrate and sodium tartrate), the properties of the double salt formed will not be the same as the properties of its component single salts.


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  • Double 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

  • Double salt — Double Dou ble (d[u^]b l), a. [OE. doble, duble, double, OF. doble, duble, double, F. double, fr. L. duplus, fr. the root of duo two, and perh. that of plenus full; akin to Gr. diplo os double. See {Two}, and {Full}, and cf. {Diploma}, {Duple}.]… …   The Collaborative International Dictionary of English

  • double salt — n. Chem. 1. a salt, as Rochelle salt, which in solution produces two different cations or anions 2. any compound regarded as a combination of two salts …   English World dictionary

  • double salt — dviguboji druska statusas T sritis chemija apibrėžtis Druska, sudaryta iš dviejų rūšių katijonų ir vienos rūgšties liekanos. atitikmenys: angl. binary salt; double salt rus. двойная соль …   Chemijos terminų aiškinamasis žodynas

  • double salt — dou′ble salt′ n. chem. a salt that crystallizes as a single substance but ionizes as two distinct salts when dissolved • Etymology: 1840–50 …   From formal English to slang

  • double salt — noun a solution of two simple salts that forms a single substance on crystallization • Hypernyms: ↑salt, ↑solid solution, ↑primary solid solution • Hyponyms: ↑alum, ↑potassium alum, ↑potash alum, ↑ …   Useful english dictionary

  • double salt — noun Date: circa 1849 a salt (as an alum) yielding on hydrolysis two different cations or anions …   New Collegiate Dictionary

  • double salt — Chem. a salt that crystallizes as a single substance but ionizes as two distinct salts when dissolved, as carnallite, KMgCl3·6H2O. [1840 50] * * * …   Universalium

  • double salt — any salt in which the two hydrogen atoms of a dibasic acid have been replaced by two separate metals or basic radicals, as in potassium sodium tartrate …   Medical dictionary

  • double salt — noun Chemistry a salt composed of two simple salts but with a different crystal structure from either …   English new terms dictionary

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