What Happens to Water When Heating CaCl2*2H2O Above 175°C?

[Andronicus1717]

What physically happens to the water when you heat CaCl2*2H2O above it's decomposition temperature 175 deg C? Does the water just vaporize? Or does it partially dissolve some of the calcium chloride in an aqueous solution and then boil away?

 

[Astronuc]

The water evaporates and one then has an anhydrous salt.

 

[chemisttree]

If the temperature used to heat the salt is substantially below 175C, the water leaves as a vapor leaving a solid powdery anhydride. If the temperature is near or above 175C, the calcium chloride melts and the water bubbles away leaving a mass of chunky calcium chloride solid.