When CaCl2 (calcium chloride) and Na2SO4 (sodium sulfate) are mixed in an aqueous solution, a double displacement reaction can occur. In this reaction, the positive ions (cations) switch places between the two compounds.
The balanced chemical equation for the reaction is:
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
In this reaction, the calcium ion (Ca2+) from calcium chloride combines with the sulfate ion (SO42-) from sodium sulfate to form calcium sulfate (CaSO4). Sodium chloride (NaCl) is also formed as a product.