What are difference between double salt and a complex salt.

What are difference between double salt and a complex salt.
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Answer :

(1) both double salts as well as complex are formed by the combination of two or more stable compounds in stiochometric ratio (2) They differ in the fact that double salts such as carnallite –KCl. MgCl2. 6H20 , Mohr’s salt FeSO4 (NH4) 2 SO4 . 6 H20 & Potash alum K2SO4 Al2(SO4) 3 .12H2O etc dissociatic into simple ions when dissolve in water . However when complex ions such as [Fe (CN) 6]4 of K4 Fe (CN) 6 do not dissociate into Fe2+ and CN- ions 
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