(a) Name the four important colligative properties. (b) What happens to the colligative properties when ethanoic acid is treated

Question

Colligative properties are properties of solutions which depend on the number of solute particles irrespective of their nature.

(a) Name the four important colligative properties.

(b) What happens to the colligative properties when ethanoic acid is treated with benzene? Give reason.

Answer 1

(a)

(1) Relating lowering of vapour pressure of the solvent

(2) Depression of freezing point of the solvent

(3) Elevation of Boiling point of the solvent

(4) Osmotic pressure of the solution

(b) Molecules of ethanoic add (acetic acid) dimenses in benzene due to hydrogen bonding. As a result of dimerisation, the actual number of solute particles in the solution is decreased. As colligative property decreases molecular mass increases.