Question

How is the molal elevation constant, K_b is related to the molality of a solution?

Answer 1

The molal elevation constant K_b​ is directly related to the elevation in boiling point (ΔT_b​) of a solution through its molality m by the formula:

ΔT_b = K_b ​⋅ m

Where,

ΔT_b​ = increase in boiling point of the solvent

K_b​ = molal elevation constant (a property of the solvent)

m = molality of the solution (moles of solute per kg of solvent)

The greater the molality of a solution, the higher the elevation in boiling point, and this elevation is proportional to the molal elevation constant K_b​.