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MODEL PAPER 5 — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 52 Marks
Question
Define molal elevation constant or ebullioscopic constant.
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Answer

Molal elevation constant is defined as increase in boiling point of the solvent, when one mole of solute is dissolved in $1000g$ of solvent. The elevation is proportional to the number of particles dissolved and given by $\Delta T_b= K _{ b }$ m,where m is the molal concentration of solute. The constant $K_b$ is the ebullioscopic constant of the solvent.

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