(a) Define

(i) Henry’s law

(ii) Crystallization

(iii) Seeding

(b) State any three methods of crystallization.

(a) (i) Henry’s law — At any given temperature, the mass of a gas dissolved by a fixed volume of liquid is directly proportional to the pressure on the surface of the liquid.

(ii) Crystallization — It is a process by which crystals of a substance are obtained by cooling a hot saturated solution.

(iii) Seeding — It is a process of inducing crystallization by adding a crystal of a pure substance into its saturated solution.

(b) Three methods of crystallization are:

1. By cooling a hot saturated solution gently
2. By cooling a fused mass
3. By sublimation