Question

The freezing point depression of a .100 m solution of NaCl solution is .34C. Calculate the percent dissociation of NaCl.( Kf for water=1.86)

Please help
bobpursley
If you assume that freezing point depression is dependent on just dissociation, then

DeltaTf= Kf*molality*(percentdissociation)*number particlesperformula

Here, the particlesperformula is 2 (Na + Cl), so solve for percent dissociation, and you will get a decimal percent. multiply itby 100 to get percent. In my head, get about 90 percent here.

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