Two solutions A and B have pH values of 2 and 9 respectively which one of these two will give a pink colour with phenolphthalein indicator?

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Solution

Bases (or alkalis) have a pH value greater than 7, while acids have a pH value less than 7. Basic solutions turn phenolphthalein indicator pink. Therefore, solution B with pH value 9 will give pink colour with phenolphthalein.

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