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The elevation in boiling point for 1 molal solution of glucose is 2 K . The depression in freezing point for 2 molal solution of glucose in the same solvent is 2 K . The relation between K b and K f is:

Options

  1. AK b = 2   K f
  2. BK b = 1 .5   K f
  3. CK b = K f
  4. DK b = 0 .5   K f

Correct answer

A. K b = 2   K f

Step-by-step solution

Freezing point depression refers to the lowering of the freezing point of solvent upon the addition of solute. Boiling point elevation refers to the increase in the boiling point of a solvent upon the addition of a solute. ∆ T b = iK b m ⇒ 2 = iK b × 1 . . . . . . . . . . . . i ∆ T f = iK f m ⇒ 2 = iK f × 2 . . . . . . . . . . . . . . . ii Dividing i ii , 1 = K b 2 K f K b = 2   K f

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