Double Salts And Co-ordination Compounds
Category : JEE Main & Advanced
When solutions of two or more stable compounds are mixed in stoichiometric (simple molecular) proportions new crystalline compounds called molecular or addition compounds are formed. These are of two types,
(1) Double salts, (2) Co-ordination or Complex compounds
(1) Double salts : Addition compounds, stable in solid state. Dissociate into ions in aqueous solution as such give test for each constituent ion. Examples
| Double Salt | Responds test for the ions |
|
Carnalite : \[KCl.\,\,MgC{{l}_{2}}6{{H}_{2}}O\] |
\[{{K}^{+}},\,\,M{{g}^{2+}},C{{l}^{-}}\] |
|
Potash alum : \[{{K}_{2}}S{{O}_{4}}.\,A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\,24{{H}_{2}}O\] |
\[{{K}^{+}},A{{l}^{3+}},SO_{4}^{2-}\] |
(2) Co-ordination or Complex compounds : Addition compound, stable in solid state. Retain their identity even in solution. Central metal ion form dative or coordinate bond with the species surrounding it (ligands). Examples :
| Complex compound | Cation | Anion |
| \[[Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}\] | \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{+2}}\] | \[SO_{4}^{2-}\] |
| \[{{K}_{2}}[Pt{{F}_{6}}]\] | \[2{{K}^{+}}\] | \[{{[Pt{{F}_{6}}]}^{2-}}\] |
| \[[Co\,{{(N{{H}_{3}})}_{6}}]\,{{[Cr\,{{(C{{N}_{3}})}_{6}}]}^{{}}}\] | \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{2+}}\] | \[\,{{[Cr\,{{(CN)}_{6}}]}^{3-}}\] |
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