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.

The answer to this question would be: its concentration is half that of the cl− ion.

When CaCl2 molecule dissolved, it will split into one Ca2+ ion and two Cl- ion. That means for every 1 CaCl2 there will be 3 ions formed. In this case, the amount of Ca2+ should be half of Cl- ion. An element with higher valence tends to have less atom in a molecule than an element with lesser valence electron.