Which of the following statements about colligative properties of dilute solutions are correct?

A $K_{b}$ is a property of the solvent only and does not depend on the solute
BA $0.1 mol k g^{- 1}$ glucose solution and a $0.1 mol k g^{- 1}$ solution of NaCl (completely dissociated) in water have the same $Δ T_{b}$
CMolality is preferred to molarity in $Δ T_{f} = K_{f} m$ because molality does not change with temperature
DFor equal molality, $Δ T_{f}$ is the same in all solvents

Answer: A, C

K_{b}

and

K_{f}

depend on solvent properties only, and molality is mass-based so it is temperature independent; these two statements are true. NaCl gives twice as many particles (

i = 2

), so its

Δ T_{b}

is twice that of glucose.

Δ T_{f} = K_{f} m

varies with

K_{f}

, which differs from one solvent to another (water

1.86

, benzene

5.12

Practice Solutions and Colligative Properties More on Elevation of boiling point and depression of freezing point

Previous questionNext question

Which of the following statements about colligative properties of dilute solutions are correct?

Answer: A, C

More questions on Elevation of boiling point and depression of freezing point