Calculate the pH of the following strong acids: 0.100 moldm-3 hydrochloric acid, HCl 0.025 moldm-3 sulphuric acid, H2SO4 0.005 moldm-3 nitric acid, HNO3 0.200 moldm-3 phosphoric acid, H3PO4 i) Ethanoic acid (CH3COOH) is a weak acid; explain why HCl is a strong acid and CH3COOH is a weak acid. Write the expression for the acid dissociation constant (Ka), for ethanoic acid. Calculate the pH of a 0.01 moldm-3 solution of ethanoic acid.(Ka CH3COOH = 1.7 x10-5 moldm-3)