a. Write equations to represent the enthalpy change of solution of:

i. Potassium sulfate

ii. Zinc chloride.

b. The enthalpies of solution of some metal halides are given below. What do these values tell you about the relative solubilities of these four compounds? 

Sodium chloride,     ΔH^θ_sol=3.9kjmol^-1

Silver chloride,         ΔH^θ_sol=+65.7 kJ mol^–1

Sodium bromide,     ΔH^θ_sol= –0.6 kJ mol^–1

Silver bromide,        ΔH^θ_sol = +84.5 kJ mol^–1