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Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds2 Marks
Question
What is the difference between a double salt and a complex?
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Answer

→ Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio.
→ They differ in the fact that double salts such as carnallite, $KCl . \quad MgCl _2 .\ \ 6 H _2 O$, Mohr's salt, $FeSO _4 \cdot\left( NH _4\right)_2 SO _4 \cdot 6 H _2 O$, potash alum, $KAl \left( SO _4\right)_2 \cdot 12 H _2 O$, etc. Dissociate into simple ions completely when dissolved in water.
→ However complex ions such as $\left[ Fe ( CN )_6\right]^{4-}$ of $K _4$ $\left[ Fe ( CN )_6\right]$ do not dissociate into $Fe ^{2+}$ and $CN ^{-}$ ions.

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