What is the relationship between vant Hoff factor and concentration of solution in molality.

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Solution

There is no relation between molality and Van 't Hoff factor - and it is not needed. Colligative properties change with concentration of whatever objects are dissolved. Concentration type doesn't have to be a molality, but they are often related to temperature change - molality doesn't change with temperature change so it is more convenient than for example molarity.
However, when you dissolve 1 mole of substance in 1 kg of solvent concentration of objects created is not necessarily 1 mole/kg, this is where the Van 't Hoff factor comes into play - on top of molality, and not being part of it.

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