Depression in freezing point, ∆T = iKm
For Na2CO3, i = 3 , m = 0.50 , K = 1.86
∆T = 3×1.86×0.50 = 2.79°C
Freezing point = 0 - 2.79 °C = -2.79°C
( 0°C is the freezing point of water).
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