Question

3. Why should a solution of a non-volatile and non-eletrolyte solute boil at a higher

temperature? Explain with the help of a diagram.​

Answer 1

Since the addition of a non-volatile solute lowers the vapour pressure of the solvent, the vapour pressure of a solution is always lower than that of the pure solvent, and hence it must be heated to a higher temperature to make its vapour pressure equal to atmospheric pressure. Thus the solution boils at a higher temperature than the pure solvent.

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