Question

Part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? hints if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion.

Answer 1

Its concentration is half that of the cl? ion. CaCl2 has one Ca^2+ ion and 2 Cl^- ions.It dissociates as follows CaCl2 -> Ca^2+ + 2Cl^- So we can see that when 1 CaCl2 dissolves we get 1 Ca2+ and 2Cl- Therefore, the concentration of Ca^+2 will be 1/2 that of Cl^- since there are 2 Cl for every Ca.