Ammonium sulphate, (NH4)2SO4, is an inorganic salt with a number of commercial uses. The most common use is as a soil fertilizer. It contains 21% nitrogen as ammonium cations, and 24% sulphur as sulphate anions.

  • Formula: (NH4)2SO4
  • Molar mass: 132.14 g/mol
  • Density: 1.77 g/cm³
  • Melting point: 235 °C
  • IUPAC ID: Diazanium sulphate
  • Soluble in: Water


  • Fertilizer
  • Industrial
  • Manufacturing in insecticides, herbicides, and fungicides


Moisture per cent by weight, maximum 1.0
Ammoniacal nitrogen per cent by weight, minimum 20.6
Free acidity (as H2SO4.) per cent by weight, maximum (0.04 for material obtained from by-product) 0.025

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