Which indicator shows a color change from colorless to pink?

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Multiple Choice

Which indicator shows a color change from colorless to pink?

Explanation:
Indicator color changes reflect how the molecule's structure shifts with pH. Phenolphthalein is colorless in acidic or near-neutral solutions and turns pink as the solution becomes basic (above about pH 8.2). That colorless-to-pink transition is the giveaway for phenolphthalein, unlike the others, which shift to yellow, blue, or red rather than pink.

Indicator color changes reflect how the molecule's structure shifts with pH. Phenolphthalein is colorless in acidic or near-neutral solutions and turns pink as the solution becomes basic (above about pH 8.2). That colorless-to-pink transition is the giveaway for phenolphthalein, unlike the others, which shift to yellow, blue, or red rather than pink.

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