Maharashtra BoardEnglish MediumSTD 12 ScienceChemistrySolutions4 Marks
Question
Write the equation relating boiling point elevation to the concentration of solution.
✓
Answer
The elevation in the boiling point of a solution is directly proportional to the molal concentration (expressed in $mol\ kg^{-1}$) of the solution.
Hence, if $\triangle T_b$ is the elevation in the boiling point of a solution of molal concentration m then,
$\triangle T_b ∝ m$
$\therefore \triangle T_b = K_b m$
where $K_b$ is a proportionality constant.
If $m = 1$ molal,
$\triangle T_b = K_b$
$K_b$ is called the ebullioscopic constant or molal elevation constant. $K_b$ is characteristic of the solvent.
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