Write a chemical equation that communicates what solid CaCl2 (subscript 2) forms when dissolved in water. Note that water is not a reactant here.

Answer 1

Since CaCl₂(s) is a strong electrolyte, it dissolves completely in water, so it will form Ca²⁺ ions and Cl^- ions. However, you must know that every mole of CaCl₂(s) will form 1 mole of Ca²⁺ ions and 2 moles of Cl^- ions (as indicated by the subscripts), so your chemical equation should look like...

CaCl₂(s) --> Ca²⁺(aq) + 2Cl^-(aq)