Answer:
Explanation:
All the colligatives properties are modified by the Van't Hoff factor. This is shown as i, in the formula of the colligative properties freezing point depression, boiling point elevation, and osmotic pressure.
The Van't Hoff factor shows the number of particles into which the solute dissociates. In organic compounds we use 1, in inorganic compounds we have to think the dissociation. For example in aquous solutions, inorganic salts as AgNOâ and CaClâ dissociate like this:
AgNOâ â Â Agâș Â + NOââ»
CaClâ Â â CaÂČâș Â + Â 2Clâ»
AgNOâ has 2 moles of ions and CaClâ has 3 moles.
In urea: i = 1
In  silver nitrate: i = 2
In calcium chloride: i = 3
The i = 3 for  calcium chloride, makes that this salt has the highest osmotic pressure, highest vapor pressure and highest boiling point.