ation of Van't HOFF for osmotic pressure.Explanation:Osmotic Pressure is defined as the minimum external pressure required to PREVENT or stop osmosis.In other words, it is the pressure exerted by solute particles on the semi-permeable membrane to prevent the flow of solvent molecules. It is represented by π.Osmotic pressure is directly proportional to Molar concentration of solution and Temperature.π=iCRTi is the Van't Hoff Factor.R is Universal Gas ConstantT is temperatureC is concentration of solution in terms of molarity.1. Non-ELECTROLYTES when added to reaction mixtures, NEITHER associate nor dissociate. THUS, Van't Hoff factor(i) is one.Example: urea, glucose.2. Electrolytes that dissociate in the solution have Van't Hoff factor greater than one.Example: Sodium chloride, Magnesium sulphate.3. Electrolytes that associate in the reaction mixture have Van't Hoff factor less than one.Example: weak organic acids.Van't Hoff equation for osmotic pressure is only applicable for dilute solutions.They cannot be applied on concentrated solutions.Solute must be non-volatile in nature.