Define van’t Hoff factor.
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 = "Observed colligative property of electrolyte solution"/"Observed colligative property of non-electrolyte solution of same concentration"`
It is related to the degree of dissociation as,
`a = "i - 1"/"n’ - 1"`
Value of i :
For association, i < 1
For dissociation, i > 1
No association or dissociation, i = 1
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