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Question

‘x’ moles of KCl and ‘y’ mole of BaCl2 are dissolved in 1 kg of water. If (x + y) = 0.1, then the observed range of ΔTf is (Kf of water = 1.86 K-kg mol−1)

Options

A.0.372°C to 0.558°C
B.0.186°C to 0.93°C
C.0.558°C to 0.93°C
D.0.372°C to 0.93°C

Solution

The e­ffective molality will be in the range of 0.2 to 0.3 and $\Delta T_{f} = K_{b}.m$ will be in the range of

1.86 × 0.2 = 0.372° C to 1.86 × 0.3 = 0.558° C.

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