Problem: Solutions containing three common acid-base indicators at various pH values. Which of these indicators is best suited to distinguish between a solution that is slightly acidic and one that is slightly basic?

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Solutions containing three common acid-base indicators at various pH values.

A series of photographs shows three different pH indicators at a number of different pHs. Methyl red is dark red at pHs 2 and 4, light red at pH 5, orange at pH 7, dark yellow at pH 9, and yellow at pH 10. Bromthymol blue is yellow at pHs 2,4, and 5, green at pH 7, and blue at pHs 9 and 10. Phenolphthalein is colorless at pHs 2,4,5, and 7, light pink at pH 9, and pink at pH 10.

Which of these indicators is best suited to distinguish between a solution that is slightly acidic and one that is slightly basic?

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