Preparing Mohr’s Salt Crystals (Volumetric Analysis)

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AIM: To prepare crystals of Mohr’s salt.


Mohr’s salt i.e. ferrous ammonium sulphate [FeSO4.(NH4)2SO4.6H2O] is a double salt. It can be prepared by making an equimolar solution of hydrated ferrous sulphate and ammonium sulphate in a minimum amount of water. A few ml of diluted H2SO4 is added to prevent the hydrolysis of FeSO4.7H2O. Cooling of the hot saturated solution yields lights green crystals of Mohr’s salt.

FeSO4.7H2O     +    (NH4)2 SO4   →  FeSO4.(NH4)2SO4.6H2O  + H2O


Colour of the crystals: Light green

Shape of the crystals: Monoclinic.

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