Question

Which of the following 0.10 m aqueous solutions will have maximum Δ T_f value?

Options

• C₁₂H₂₂O₁₁

• KI

• Al₂(SO₄)₃

• NH₂- CO-NH₂

Answer 1

Al₂(SO₄)₃

Explanation:

On the give 0.10 m aqueous solution, Al₂(SO₄)₃ will have maximum Δ T_f value.

The expression for the freezing point of the solution is

Δ T_f = iK_f · m

van't Hoff factor (1), is highest for Al₂(SO₄)₃, which is 5. Hence, it will give maximum Δ T_f value.