what are double salts? give some examples.

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 lattice structure. 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

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