Question

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

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

Options

• C₁₂H₂₂O₁₁

• KI

• Al₂(SO₄)₃

• NH₂-CO-NH₂

• C₆H₁₂O₆

• KCl

• K₂SO₄

Answer 1

Al₂(SO₄)₃

Explanation:

In the given 0.10 m aqueous solution, Al₂(SO₄)₃ will have the maximum ΔT_f value.

The expression for the freezing point of the solution is

Δ T_f  = i K_f · m

van’t Hoff factor (i), is highest for Al₂(SO₄)₃, which is 5. Hence, it will give the maximum ΔT_f value.