Question

Calcium chloride is sometimes sprinkled on winter sidewalks to melt snow and ice. If 333g of calcium chloride is dissolved completely in 1.00 kg of water, what will be the freezing point of the solution? (The molal freezing point depression constant for water is 1.86°C kg/mol)

• A. -5.58°C
• B. -9.30°C
• C. -11.7°C
• D. -16.7°C

Hint:

For colligative properties like freezing point depression, only the number of solute particles matters.

Answer 1

The Correct Option is A

Using the formula for freezing point depression, we calculate the change in freezing point: \[ \Delta T_f = K_f \cdot m \] Where Kf is the freezing point depression constant and m is the molality of the solution.