Formula For Elevation of Boiling Point

Sep 06, 2022, 16:45 IST

Elevation in Boiling Point : 

The vapour pressure of a solution is lower than that of pure solvent (on adding non-volatile solute). Now, the boiling point (BP) of a liquid is the temperature at which its vapour pressure becomes equal to 760 mm of Hg column (atmospheric pressure). Hence, the BP of a solution will always be higher than that of the pure solvent.

Example For Elevation of Boiling Point

Example 1

Elevation in the boiling point for 1 molal solution of glucose is 2 K. The depression in the freezing point for 2 molal solution of glucose in the same solvent is 2 K. The relation between K_b and K_f is:

A. K_b = 1.5 K_f
B. K_b = 0.5 K_f ­
C. K_b = 2 K_f
D. K_b = K_f ­

Ans. C

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