Q.Define double salts with suitable examples.
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Start your 14-day free trial to unlock the full solution →A double salt exists as a single compound in the solid but breaks up into all its simple ions in solution.
When two or more stable salts combine in a fixed molar ratio, they form addition compounds. These are of two types — double salts and complex (coordination) compounds. Double salts are the ones that are stable only in the solid crystalline state.
Definition: A double salt is an addition (molecular) compound which is stable in the solid state but, when dissolved in water, dissociates completely into its constituent simple ions — i.e. it loses its identity in solution and gives the tests of all the ions present.
Example: Mohr's salt, FeSO4·(NH4)2SO4·6H2O, in water gives Fe2+, NH4+ and SO4^2- ions and shows the normal tests for Fe2+ ions.
Other examples:
- Potash alum: K2SO4·Al2(SO4)3·24H2O …
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