Chemistry · Oct / Nov 2022 · Paper 12 · Question 27
5070The characteristic properties of acids and bases
The table shows the pH values of some substances that can be consumed by humans. | substance | pH value | |---|---| | P | 6.6 | | Q | 3.1 | | R | 10.4 | | S | 7.8 | Which statement about these substances is correct?
- AP is alkaline.
- BQ has the lowest concentration of hydrogen ions.
- CR can neutralise excess stomach acid.
- DS has a pH value closest to neutral.
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Correct answer: C. R can neutralise excess stomach acid.
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