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Question

what is complex salts and double salts?

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Solution

Double salts are molecular compounds which are formed by the evoporation of solution containing 2 or more salts in stoichiometric proportions. They dissociate into their constituent ions in solution

eg: K2SO4.Al2(SO4)3.24H2O ------> 2K+ + 2Al3+ + 4SO42- + 24H2O

A complex compound is a compound formed from a lewis acid and a lewis base. They do not dissociate into its constituent ions in solutions

eg: Fe(CN)2 + 4KCN ---> K4[Fe(CN)6]

K4[Fe(CN)6] on dissociation gives 4K+ + [Fe(CN)6]4-

In K4[Fe(CN)6] the individual components lose their identity. The metal of the complex ion is not free in solution unlike the metal in double salt solution.

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