An aqueous solution of calcium chloride contains 2 g of calcium chloride (molar mass 110.98 g mol-1) in 100 ml. Calculate the concentration of chloride ion in the solution

Question

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Answer 1

How many mols in 2 g CaCl2?
2 g x (110.98 g CaCl2/1 mol CaCl2) = ?? mols
M = # mols/L = ??mols/0.100 L = xx molar.

There are two mols Cl^- per 1 mol CaCl2; therefore, (Cl^-) is twice that for CaCl2.