Answer
CaCl$_{2}$ produces three particles once it dissolves. NaCl produces two particles once it dissolves. Freezing-point depression therefore depends upon the number of solute particles in any given solvent.
Work Step by Step
CaCl$_{2}$ produces three particles once it dissolves. NaCl produces two particles once it dissolves. Freezing-point depression therefore depends upon the number of solute particles in any given solvent.