Mohr’s salt

Mohr’s salt is a ferrous ammonium salt also called double salt represented by [FeSO4(NH4)2SO4.6H2O]. It is prepared by dissolving equimolar quantities of ferrous sulphate and ammonium sulphate in hot water containing little H2SO4. This solution on cooling gives green blue crystal called Mohr’s salt.

Note: Mohr’s salt is named after the German chemist Karl Friedrich Mohr who made many important advances in the methodology of titration in the 19th century.

Physical properties:

  • It is pale green crystalline compound.
  • It is non-efflorescent and chemically similar to ferrous sulphate.
  • It is a strong reducing agent. It reduces KMnO4, K2Cr2O etc.


  • It is used as a laboratory reagent.
  • It is used to kill the moss without harming the grass.

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