Which is the correct expression of van't Hoff factor for association of electrolyte?
Here,
n is the number of molecules associate to form n-mer β is the degree of dissociation
A
i=2+[1n−1]β
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B
i=1+[n−1]β
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C
i=1+[1n−1]β
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D
i=1+[1n+1]β
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Solution
The correct option is Ci=1+[1n−1]β Association of electrolyte: nA⇌An t=0:C0 t=teq:C(1−β)cβn
At equilibrium, Net concentration =C−Cβ+cβn =C[1+[1n−1]β]