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A 0.561 m solution of an unknown elecro...

A 0.561 m solution of an unknown elecrolyte depresses the freezing point of water by `2.93^(@)C`. What is van't Hoff factor for the electrooyte ? The freezing point depression constant `(K_(f))` for water is 1.86 kg `mol^(-1)`.

Text Solution

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The correct Answer is:
2.81
`i=(DeltaT_(f))/(K_(f)xxm)`
`DeltaT_(f)=2.93^(@)C, 2.93 K, m = 0.561 " mol kg"^(-1)`
`K_(f)=1.86^(@)C" kg mol"^(-1)=1.86" K kg mol"^(-1)`
`i=((2.93K))/((1.86" K kg mol"^(-1))xx(0.561" mol kg"^(-1)))=2.81`
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