Mohr’s salt or ferrous ammonium sulphate FeSO4(NH4)2 SO4.6H2O)

Hydrated ferrous ammonium sulphate is commonly known as mohr’s salt .It is prepared by crystallization of equimolar solution of FeSO4 and (NH4)2SO4.

FeSO4(aq) + (NH4)2SO4      crystallization    →         FeSO4 (NH4)2SO4.6H2O.

                                                                                    Mohr’s salt.

This double salt is more stable than FeSO4 alone and is used as reducing agent in redox fitration. During redox reaction Fe+2 ions mohr’s salt is oxidised to Fe+3 ions.


 (Properties same as FeSO4. 7H2O)