Water is added to a mixture of solid CaCl2 and CaCO3 and the resulting mixture is filtered using a piece of filter paper and a filter funnel. What is the identity of the residue?

CaCO3 (calcium carbonate)

Explanation:

When adding water, CaCl2 (calcium chloride) is soluble, whereas calcium carbonate is not.

This means the calcium chloride will dissolve in the water but the calcium carbonate will not.

When it is filtered, the dissolved calcium chloride will pass straight through the filter paper with the water, whereas the calcium carbonate will be left as a residue as it is insoluble.

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