Calcium compounds: calcium dichloride

calcium symbol icon

The calcium in calcium dichloride formally is in the oxidation state 2.

Crystal structure of calcium dichloride

Calcium dichloride

  • Formula as often written: CaCl2
  • Hill system formula: Ca1Cl2
  • CAS registry number: [10043-52-4]
  • Formula weight: 110.983
  • Class: chloride


  • calcium dichloride
  • calcium(II) chloride
  • calcium chloride

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 782°C; 775°C
  • Boiling point: >1600°C
  • Density: 2150 kg m-3


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Element analysis

Element percentages for the elements in calcium dichloride
Element %
Ca 36.11
Cl 63.89


Calcium chloride may be made by the neutralization of CaCO3 with HCl

CaCl2(aq) + (NH4)2CO3(aq) → CaCl2(aq)

Solid state structure

  • Geometry of calcium:
  • Prototypical structure:

Crystal structure of calcium dichloride

Isotope pattern

What follows is the calculated isotope pattern for the CaCl2 unit with the most intense ion set to 100%.

Formula: Ca1Cl2

mass  %
110 100.0 __________________________________________________
111 0.0
112 64.6 ________________________________
113 0.1
114 12.8 ______
115 0.1
116 1.4 _
117 0.0
118 0.4
119 0.0
120 0.1
121 0.0
122 0.0


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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calcium atomic number