Phenolphthalein in acidic solution is which color?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Phenolphthalein in acidic solution is which color?

Explanation:
Phenolphthalein is an indicator that changes color with pH because its molecule shifts between a colorless, protonated form and a pink, deprotonated form as the solution becomes basic. In acidic conditions the molecule stays in the colorless form, so the solution appears colorless. The pink color only appears in basic solutions when the indicator is deprotonated and the conjugated structure is extended. Therefore, in an acidic solution the color is colorless.

Phenolphthalein is an indicator that changes color with pH because its molecule shifts between a colorless, protonated form and a pink, deprotonated form as the solution becomes basic. In acidic conditions the molecule stays in the colorless form, so the solution appears colorless. The pink color only appears in basic solutions when the indicator is deprotonated and the conjugated structure is extended. Therefore, in an acidic solution the color is colorless.

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