Define molal elevation constant (Ebullioscopic constant)? Does it… - Vidyadip

Question

Define molal elevation constant (Ebullioscopic constant)? Does it depend on the nature of a solute ? What are its units ?

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Answer

(1) Molal elevation constant (Ebullioscopic constant) : It is defined as the elevation in boiling point, produced by dissolving one mole of a solute in $1 kg$ (or $1000 gram$ ) of a solvent (i.e. 1 molal solution).
The elevation in the boiling point,
$\Delta T_b$ is given by $\Delta T_b=K_b \times m$
where $Kb$ is molal elevation constant and $m$ is molality of the solution.
$\therefore$ When $m =1, \Delta T _{ b }= K _{ b }$
(2) $K_b$ depends only on the nature of the solvent.
(3) $K _b$ does not depend on the nature of the solute.
(4) It does not depend on concentration of the solution.
(5) The units of molal elevation constant are:
(A) $K kg mol ^{-1}$ and (B) $Km ^{-1}$.

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