pH and indicators

1 mark · Normal

Which pH value shows a strongly alkaline solution?

ApH 2BpH 6CpH 9DpH 13

› Show answer

Correct option: pH 13

Common mistakes: Choosing pH 9, which is weakly alkaline

› Show mark scheme and worked solution

Marking points

B1 · 1 mark · pH 13 correctly identified as strongly alkaline.

Worked solution

Strongly alkaline solutions have pH 11–14, so pH 13 is correct.

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