Q.

The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is -4.5oc. Calculate the van't Hoff factor i, for this solution.(Kf =1.86Kkgmol-1) (up to 1 decimal)

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answer is 1.8.

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Detailed Solution

ΔTf=iKfm  mKCl=1074.5×1000100=1.34m ; ΔTf=0-(-4.5)=4.5oc i=ΔTfKfm=4.51.86×1.34=1.805
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The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is -4.5oc. Calculate the van't Hoff factor i, for this solution.(Kf =1.86Kkgmol-1) (up to 1 decimal)