Q.

The freezing point depression constant for water is –1.860C m–1. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O, the freezing point is changed by –3.820C, calculate the van't Hoff factor for Na2SO4.

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Detailed Solution

Kf(H2O) = 1.86KKgmole-1Note:     can be in celcius(or)Kelvin scale.Magnitude of change in temp. will be the same irrespective of the scale in which the temp. is measured
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The freezing point depression constant for water is –1.860C m–1. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O, the freezing point is changed by –3.820C, calculate the van't Hoff factor for Na2SO4.