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Question

What will be the value of van't Hoff fator for K3[Fe(CN)6], if it undergoes 75% dissociation in aqueous medium?

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Solution

K3[Fe(CN)6] will dissociate as,
K3[Fe(CN)6]3K++[Fe(CN)6]3C00CCα3CαCα
Therefore, van't Hoff fator, (i)=CCα+3Cα+CαC=1+3α
Here, given, α=0.75
i=1+3×0.75=3.25

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