Freezing Point Depression

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

Solution

Conc req’d = 5.38 molal

This means we need 5.38 mol of dissolved particles per kg of solvent.

**Recognize that m represents the total conc. of all dissolved particles.

Recall that 1 mol NaCl(aq) --> 1 mol Na+(aq) + 1 mol Cl-(aq)

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