Question

What will be the freezing point of a $0.5m$KCl solution?

The molal freezing point constant of waters$1.86ºCm^{- 1}$

• A. $- 1.86ºC$
• B. $- 0.372ºC$
• C. $- 3.2ºC$
• D. $0ºC$

Answer 1

Answer: (A)

$- 1.86ºC$

Answer 2

$\Delta T_{f} = ik_{f} \times m = 2 \times 1.86 \times 0.5 = 1.86ºC$

$T_{f} = Tº_{f} - \Delta T_{f} = 0 - 1.86 = - 1.86ºC$