Question

Describe how you would prepare dry sample of calcium chloride in the laboratory

Answer 1

What's the problem? Stick a CaCl2 sample in an oven at 105 Celsius for an hour. The real problem with trying to use anhydrous CaCl2 is that it is such a good dehydrating agent that the minute you take it out of the oven it starts hydrating itself. It is difficult to use anhydrous CaCl2 since small amounts of water are almost always present.