What is a double salt ? Give an example.

Explanation

Double salts are those compounds which lose their identities in solutions and break down into simple ions and exist in crystalline state. Example: Double salts like Potash alum `(K_2SO_4. AI_2 (SO_4)_3.2H_2O)` in aq. solution break down into `K^+, AI^3+, SO_4`. ions where they lose their identity.
`K_2SO_4.AI_2(SO_4)_3. 24H_2OrarrK^(+)+2AI^(3+)+4SO_4^(=)+24H_2O`