Question

If cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) 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

The concentration of Ca2+ ions is half that of the Cl- ions.

Answer 2

Answer: The correct answer is its concentration is half that of the $Cl^-$ ion.

Explanation:

We are given a chemical compound having formula $CaCl_2$

It is an ionic compound because it is formed by the combination of $Ca^{2+}\text{ and }Cl^-$ ion

When an ionic compound is dissolved in water, it breaks into its ions. The chemical equation for the ionization of calcium chloride follows:

$CaCl_2\rightarrow Ca^{2+}+2Cl^-$

By stoichiometry of the reaction:

1 mole of calcium chloride produces 1 mole of calcium ions and 2 moles of chloride ions

From above, it is visible that number of chloride ions is twice that of calcium ion and so will be its concentration.

Thus, the concentration of calcium ions will be half that of chloride ions.