Ammonium Ferrous Sulphate

Ammonium Ferrous Sulphate

Ammonium Ferrous Sulphate , or Mohr's Salt, is the inorganic compound with the formula (NH₄)₂Fe(SO₄)₂·6H₂O. Containing two different cations, Fe²⁺ and NH₄⁺, it is classified as a double salt of ferrous sulfate and ammonium sulfate. It is a common laboratory reagent. Like the other ferrous sulfate salts, ferrous ammonium sulfate dissolves in water to give the aquo complex [Fe(H₂O)₆]²⁺, which has octahedral molecular geometry.

This compound is a member of a group of double sulfates called Schönites or Tutton's salts. which form monoclinic crystals and have formula M₂N(SO₄)₂.6H₂O. This group can mix metals and crystallise on other schönite crystals.