Define van’t Hoff factor. How is it related to the degree of diss… - Vidyadip

Question

Define van’t Hoff factor. How is it related to the degree of dissociation?

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Answer

The van’t Hoff factor is defined as the ratio of observed colligative property produced by a given concentration of electrolyte solution to the property observed for the same concentration of non-electrolyte solution.
Van't Hoff factor :
To account for the extent of dissociation or association, van’t Hoff introduced a factor i , known as the van’t Hoff factor.
$i=\frac{\text { Observed colligative property of electrolyte solution }}{\text { Observed colligative property of non-electrolyte solution of same concentration }}$
It is related to the degree of dissociation as,
$a=\frac{ i -1}{ n ^{\prime}-1}$
Value of i :
For association, i < 1
For dissociation, i > 1
No association or dissociation, i = 1

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