Ammonium iron(II) sulfate

Ammonium iron(II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH4)2SO4·Fe(SO4)·6H2O.

This compound is a member of a group of double sulfates called Schönites or Tutton's salts.

In analytical chemistry, this salt is the preferred source of ferrous ions as the solid has a long shelf life, being resistant to oxidation.

The ammonium ions make solutions of Mohr's salt slightly acidic, which slows this oxidation process.

[5] Common impurities include magnesium, nickel, manganese, lead, and zinc, many of which form isomorphous salts.

NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 0: Will not burn. E.g. water Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code
Structure of ferrous ammonium sulfate with hydrogen bonding network highlighted (N is violet, O is red; S is orange, Fe is light red).