(a) What is osmotic pressure? (b) Molecular mass of NaCI determined by osmotic pressure measurement is found to be half of the actual value.

Question

Osmotic pressure is a colligative property and it is proportional to the molarity of the solution.

(a) What is osmotic pressure?

(b) Molecular mass of NaCI determined by osmotic pressure measurement is found to be half of the actual value. Account for it.

(c) Calculate the osmotic pressure exerted by a solution prepared by dissolving 1.5 g of a polymer of molar mass 185000 in 500 mL of water at 37°C. [R = 0.0821 L atm K^-1 mol^-1].

Answer 1

(a) Osmotic pressure is the extra pressure applied on the solution to stop osmosis

(b) NaCI, as a strong electrolyte dissociates to form Na+ and Ch ions. The number of particles doubles colligative property also doubles. Observed molecular mass will be half.

(c)