Characteristic

Ammonium iron(II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH4)2Fe(SO4)2(H2O)6. Containing two different cations, Fe2+ and NH4+, it is classified as a double salt of ferrous sulfate and ammonium sulfate.

Chemical formula:Fe(SO₄)(NH₄)₂(SO₄) (anhydrous)

                Fe(SO₄)(NH₄)₂(SO₄)·6H₂O (hexahydrate)

Molar mass:284.05 g mol−1 (anhydrous)

            392.13 g mol−1 (hexahydrous)

Appearance:Blue-green solid

Density:1.86 g/cm³

Melting point:100 to 110 °C (212 to 230 °F; 373 to 383 K)

Boiling point:Not applicable

Solubility in water:269 g/L (hexahydrate)

Application

Ammonium iron(II) sulfate hydrate is widely utilized in analytical chemistry for titration purposes since it is affected lesser by oxygen in the air than iron(II) sulpahte. It is employed to measure high doses of gamma rays by using Fricke's dosemeter. It is involved in a variety of other applications from nanomaterials to general redox reactions. It is used in the medical field as an antianemic agent for treatment of iron deficiency.