Barium dichloride dihydrate

  • Formula: BaCl2.2H2O
  • Hill system formula: Ba1Cl2H4O2
  • CAS registry number: [10326-27-9]
  • Formula weight: 244.263
  • Class: chloride
  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 120°C (dehydrates)
  • Boiling point:
  • Density: 3097 kg m-3

The following are some synonyms of barium dichloride dihydrate:

  • barium dichloride dihydrate
  • barium(II) chloride 2-water
  • barium chloride 2-water

The oxidation number of barium in barium dichloride dihydrate is 2.


Barium chloride dihydrate is made by the neutralization of barium hydroxide with HCl in water. The product crystallizes as the dihydrate BaCl2.2H2O. If this heated, dehydration to anhydrous BaCl2 occurs.

Ba(OH)2 + 2HCl(aq) → BaCl2(aq) + 2H2O

Element analysis

The table shows element percentages for BaCl2.2H2O (barium dichloride dihydrate).

Element %
Ba 56.22
Cl 29.03
H 1.65
O 13.10

Isotope pattern for BaCl2.2H2O

The chart below shows the calculated isotope pattern for the formula BaCl2.2H2O with the most intense ion set to 100%.


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.

Explore periodic propertes from these links