A solution is prepared by dissolving calcium chloride in water and diluting to 500.0 mL. If this solution contains 44 ppm chloride ions, the concentration of calcium ions is ________ ppm.
A)44
B)88
C)22
D)11
E)500

Question

Quizplus · Accepted Answer

Calcium chloride (CaCl2) dissociates into one calcium ion (Ca²⁺) and two chloride ions (Cl⁻). If the solution contains 44 ppm of chloride ions, the concentration of calcium ions will be half of that, which is 22 ppm, because there are two chloride ions for every one calcium ion.

A Solution Is Prepared by Dissolving Calcium Chloride in Water