pH and indicators
2 marks · EasyExplain why a solution with a pH of 5 is not considered strongly acidic. Include information about the pH scale in your answer.
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Also accept: A pH of 5 is only weakly acidic, because strong acids have a pH between 0 and 3.; Because pH 5 is outside the strong acid range of 0–3, it is only weakly acidic.
Common mistakes: Not explaining the number range for strong acids
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Marking points
M1 · 1 mark · States pH 5 is not strongly acidic (but weakly acidic)
A1 · 1 mark · Describes where strong acids appear on the pH scale (pH 0-3) or similar correct range
Worked solution
A solution with pH 5 is called weakly acidic, because strong acids have a pH between 0 and 3 on the pH scale.