26d. Outline why pH is more widely used than [H+ ] for measuring relative acidity. [1 mark]

26b. Excess hydrochloric acid is added to lumps of calcium carbonate. The graph shows the volume of carbon dioxide gas produced over time. Sketch a curve on the graph to show the volume of gas produced over time if the same mass of crushed calcium carbonate is used instead of lumps. All other conditions remain constant. [1 mark]