May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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13Ph Curves IndicatorsMedium1 mark
Which pH titration curve shows the result of a titration of a strong alkali with a weak acid?
Four pH-against-volume-of-acid-added titration curves (A to D): A starts flat at pH 14, falls in an S-shaped drop around pH 8-9, and levels off just above pH 5; B starts near pH 11, falls gradually with a shallow shoulder, drops steeply through about pH 3, and levels off just above pH 0; C starts flat at pH 14 and falls in one steep S-shaped drop centred near pH 7, levelling off just above pH 0; D starts near pH 11 and falls gradually and steadily throughout with only a slight shoulder and no sharp drop, levelling off just above pH 5.