Zinc compounds: zinc sulphate heptahydrate

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The zinc in zinc sulphate heptahydrate formally is in the oxidation state 2.

Zinc sulphate heptahydrate

  • Formula as often written: ZnSO4.7H2O
  • Hill system formula: H14O11S1Zn1
  • CAS registry number: [7446-20-0]
  • Formula weight: 287.561
  • Class: complex


  • zinc sulphate heptahydrate
  • zinc(II) sulphate 7-water
  • zinc sulfate 7-water
  • zinc sulfate heptahydrate
  • zinc sulphate 7-water
  • zinc(II) sulfate 7-water

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 100°C (dehydrates)
  • Boiling point: decomposes at > 500
  • Density: 1957 kg m-3


Coming soon...

Element analysis

Element percentages for the elements in zinc sulphate heptahydrate
Element %
H 4.91
O 61.20
S 11.15
Zn 22.74


Not available

Isotope pattern

What follows is the calculated isotope pattern for the ZnSO4.7H2O unit with the most intense ion set to 100%.

Formula: Zn1S1O11H14

mass  %
286 100.0 __________________________________________________
287 1.4 _
288 64.0 ________________________________
289 9.3 _____
290 42.7 _____________________
291 1.1 _
292 3.9 __
293 0.1
294 0.1


The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

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