Answer: The correct answer is its concentration is half that of the [tex]Cl^-[/tex] ion.
Explanation:
We are given a chemical compound having formula [tex]CaCl_2[/tex]
It is an ionic compound because it is formed by the combination of [tex]Ca^{2+}\text{ and }Cl^-[/tex] ion
When an ionic compound is dissolved in water, it breaks into its ions. The chemical equation for the ionization of calcium chloride follows:
[tex]CaCl_2\rightarrow Ca^{2+}+2Cl^-[/tex]
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.
