Calcium chloride

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Author: Amelie Stahlbuhk
back to Chloride


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Abstract[edit]

The different hydrate stages of calcium chloride are presented, as well as their behavior regarding solubility and hygroscopicity.

Hydrate stages[edit]

Sinjarite: CaCl2•2H2O
Calcium chloride tetrahydrate: CaCl2•4H2O
Antarcticite: CaCl2•6H2O

Solubility[edit]

Figure 1: Solubility of calcium chloride in water. The molality m [n(CaCl2•xH2O)•kg(H2O)-1] is plotted against the temperature.


Under standard conditions the hexahydrate of calcium chloride Antarcticite is the stable form. The salt has got a high solubility in water which increases with increasing temperatures. The dehydration steps to the calcium chloride tetrahydrate and to sinjarite take place at temperatures of 30 °C and 45 °C, respectively.

Hygroscopicity[edit]

Figure 2: Deliquescence behaviour of calcium chloride in the temperature range from -45 to 80 °C. The water activity aw is plotted against the temperature.


References[edit]

Literature[edit]