a) The chemical reaction equilibrium constant K is defined in terms of activities of reactant and product species. However, calculations are sometimes simplified by making realistic assumptions. Suggest the simplified expressions for K under the following situations for liquid phase reactions: (i) When the standard state for liquid is the state of pure liquid at the system temperature and at 1 bar. [2 marks] (ii) When the liquid volume is assumed independent of pressure. [2 marks] (iii) When pressure is low to moderate. [2 marks] (iv) When the species are present in high concentration [2 marks] (v) When the solution is ideal liquid. [2 marks]