It might be instructive to ask students to try to plot a graph to show how the hydrogen ion concentration changes as 0.100 mol dm-3 sodium hydroxide solution is added to 50.0 cm3 of 0.100 mol dm-3 hydrochloric acid solution. The initial value before any of the sodium hydroxide solution has been added will be 1.00 x 10-1 mol dm-3 and the final value when 100 cm3 of the sodium hydroxide solution has been added will be...