Question

The freezing point of Imolal NaCl solution assuming NaCl to be 100% dissociated in water is
(A)-1.86°C (B)-3.72°C (C) +1.86°C (D) 43.72°C
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Answer 1

Hi there,

☆ Answer is (B)

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☆ Given

● NaCl conc. = 1 molal

● NaCl = Na + Cl , so number of ions is 2

● Water Kf = 1.86 °c/m

◇ Delta.T = Kf × m × ions no.

D.T = 1.86 × 1 × 2 = 3.72

◇ D.T = Tf solute - Tf solution

3.72 = 0 - Tf solution

◇Freezing point of NaCl Solution is

-3.72 °c

♡ Hope the answer is helpful

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