Answer in brief. What is the difference between a double salt and a complex? Give an example. - Chemistry

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Answer in Brief

Answer in brief.

What is the difference between a double salt and a complex? Give an example.

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Solution 1

Double salt Complex
(1) Double salts exist only in the solid state and dissociate into their constituent ions in the aqueous solutions. (1) Coordination compounds exist in the solid-state as well as in the aqueous or non-aqueous solutions.
(2) Double salts lose their identity in the solution. (2) They do not lose their identity completely.
(3) The properties of double salts are same as those of their constituents. (3) The properties of coordination compounds are different from their constituents.
(4) Metal ions in the double salts show their normal valence. (4) Metal ions in the coordination compounds show two valences namely primary valence and second­ary valence satisfied by anions or neutral molecules called ligands.
(5) For example in K2SO4. K2SO4. A12(SO4)3. 24H2O. The ions K+, Al3 + and SO4 show their properties. (5) In K4[Fe(CN)6], ions K+ and [Fe(CN)6]4‘~ ions show their properties.

Solution 2

A double salt dissociates in water completely into simple ions, whereas a coordination complex dissociates in water with at least one complex ion.

e.g. Mohr's salt, FeSO4(NH4)2SO4.6H2O is a double salt while K4[Fe(CN)6] is a complex. 

Concept: Types of Ligands
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Chapter 9: Coordination Compounds - Exercises [Page 208]

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Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 9 Coordination Compounds
Exercises | Q 3.03 | Page 208

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