Question
What is the difference between a double salt and a complex? Give an example.
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Answer
| Double salt | Coordination compound (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 $K_2SO_4. K_2SO_4. A1_2(SO_4)_3. 24H_2O$. The ions $K^+, Al^{3 +}$ and $SO_4$ show their properties. | (5) In $K_4[Fe(CN)_6]$, ions $K^+$ and $[Fe(CN)_6]^4‘~$ ions show their properties. |
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