Question

The indicator phenolphthalein is colorless in an acid but changes color to pink in a base. Which liquid would cause the phenolphthalein indicator to change color to pink? (1 point)

a liquid with pH 3

a liquid with pH 7

a liquid with pH 9

a liquid with pH 5

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Answer 1

Phenolphthalein changes color to pink in basic solutions, typically when the pH is above 8.2. Among the options provided, a liquid with **pH 9** would cause the phenolphthalein indicator to change color to pink.

So, the correct answer is:

**a liquid with pH 9**.