What color is universal indicator in a strong alkali?

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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

What color is universal indicator in a strong alkali?

Explanation:
Universal indicator changes color across the pH scale because it’s a mixture of several indicators. In very alkaline (strong base) solutions, the pH is very high, around 13–14, which corresponds to the purple end of the indicator’s color range. So the color for a strong alkali is purple. Red would signal acidic solutions, green is near neutral, and blue indicates a base but not as strongly alkaline as purple.

Universal indicator changes color across the pH scale because it’s a mixture of several indicators. In very alkaline (strong base) solutions, the pH is very high, around 13–14, which corresponds to the purple end of the indicator’s color range. So the color for a strong alkali is purple. Red would signal acidic solutions, green is near neutral, and blue indicates a base but not as strongly alkaline as purple.

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