Introduce the self ionization of water into hydrogen and hydroxide ions. Show it as an equilibrium equation. Discuss the concentration of hydrogen(hydronium ) ions and hydroxide ions formed, and the concentrations being 1x10-7 moles for each, at equilibrium. State and write the equilibrium constant expression for water and note -that it is 1 x 10^-14. Use the Kw expression to determine the concentration of OH- ions when [H+] ions are given and vice versa. Discuss how to determine if a solution is acidic or basic based on the concentrations of ions. Work 2-3 examples