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If CaCl2 is mixed with Na2SO4 in aqueous solution, which of the following is a possible product?

A NaCl

If these compounds are mixed in aqueous solution, a double displacement reaction will likely occur, because they are both ionic compounds. As a result, the two primary products formed will be NaCl and CaSO4 (but not Ca2SO4 because this molecule would have to hold a charge, and would be unstable).