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  4. How many ions per molecule are produced in the solution when Mohr's salt is dissolved in excess of water?

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Q. How many ions per molecule are produced in the solution when Mohr's salt is dissolved in excess of water?

Coordination Compounds

Solution:

Mohr's salt is $FeSO _{4} \cdot\left( NH _{4}\right)_{2} SO _{4} \cdot 6 H _{2} O$.
When it is dissolved in excess of water, one molecule forms one $Fe ^{2+}$ ion, two $NH _{4}{ }^{+}$ions and two $SO _{4}^{2-}$ ions (i.e., total five ions per molecule).