Which indicator is pink in alkaline conditions?

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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

Which indicator is pink in alkaline conditions?

Explanation:
Indicator color changes reveal pH. In alkaline conditions, phenolphthalein turns pink. It stays colorless in acidic or neutral solutions, then undergoes a structural change as the pH rises above about 8.2, giving a pink colour that becomes more intense as the solution becomes more basic. The other indicators behave differently in base: litmus goes blue (not pink), methyl orange shifts to yellow, and bromothymol blue shifts to blue as it becomes basic. So pink in alkaline conditions specifically points to phenolphthalein.

Indicator color changes reveal pH. In alkaline conditions, phenolphthalein turns pink. It stays colorless in acidic or neutral solutions, then undergoes a structural change as the pH rises above about 8.2, giving a pink colour that becomes more intense as the solution becomes more basic. The other indicators behave differently in base: litmus goes blue (not pink), methyl orange shifts to yellow, and bromothymol blue shifts to blue as it becomes basic. So pink in alkaline conditions specifically points to phenolphthalein.

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