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InterviewSolution
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DerĂŞveusingan enpreen fore moleclar mass of saluteelevation in boiling point ? |
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Answer» Elevation of boiling point It is known that a liquid boils only when its vapour pressure becomes equal to the atmospheric pressure. But when a non-volatile solute is added to the solvent, the vapour pressure is lowered. In order to boil the solution, the temperature has to be raised further so as to make its vapour pressure equal to atmospheric pressure. The raising of temperature is known as elevation of boiling point (delta Tb). It depends upon the number of moles of the added non-volatile solute. Thus,delta Tb directly proportional to m delta Tb = Kb*m Where Kb= molal boiling point elevation constant and ‘m’ = molality of the solute. |
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