Why is molality used for colligative properties?

are physical properties of , like boiling point elevation and freezing point depression. In these calculations, the temperature of the solution is changing as we add more to the , so this means that the volume of the solution is changing. Since is moles solute per liter of solution, we cannot use molarity as our concentration unit. This is why we use (moles solute per kg of solvent) since the kg of solvent doesn’t change with temperature.

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