Freezing Point Depression

How much NaCl must be dissolved in 4.00 kg of water to lower FP to -10.00 oC?.

FP depression = DTf = Kf•m; Kf = -1.86 oC/molal

Solution

Calc. required molality

DTf = Kf • m

-10.00 oC = (-1.86 oC/molal) • Conc

Conc = 5.38 molal

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