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Question

Chemistry Question on coordination compounds

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

A

4

B

5

C

6

D

10

Answer

5

Explanation

Solution

Double salt (such as Mohr salt) dissociate into simple substances or ions completely when dissolved in water. Mohr' salt is

FeSO4.(NH4)2SO4.6HzO{FeSO4 . (NH4)2SO4 . 6HzO}
FeSO4.(NH4)2SO4.6HzO>[Exces of ][water]Fe2++2NH4+2SO42+6H2O{FeSO4 . (NH4)2SO4 . 6HzO ->[{\text{Exces of }}][{\text{water}}] Fe^{2+} + 2NH4+ 2SO4^2- + 6H2O}

So, total ions dissociated 5.