The freezing point of water is depressed by 0.37 o C in a 0.01 molal N a C l solution. The freezing point of 0.02 molal solution of urea is depressed by

Question

The freezing point of water is depressed by 0.37 o C in a 0.01 molal N a C l solution. The freezing point of 0.02 molal solution of urea is depressed by, 0.37 o C, 0 o C, 0.56 o C, 0.187 o C

MARKS App · Accepted Answer

The depression in freezing point is proportional to molal concentration of the solute i.e., Δ T f ∝ m Δ T f = K f m i or K f = Δ T f i × m = c o n s t a n t So, Δ T ƒ N a C l i N a C l × m N a C l = Δ T f i × m = c o n s t a n t 0.37 2 × 0.01 = Δ T f U r e a 0.02 × 1 Δ T f = 0.37 × 0.02 0.02 = 0.37 ° C

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