Question

what are double salt ?​

Answer 1

a crystalline salt having the composition of a mixture of two simple salts but with a different crystal structure from either.

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Answer 2

A double salt is a salt that contains more than one different cation or anion. ... When dissolved in water, a double salt acts as a mixture of the two separate salts: it completely dissociates into simple ions while a hexaaquo complex does not; the complex ion remains unchanged.