What color is universal indicator in a weak 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 weak alkali?

Explanation:
Universal indicator shows color changes according to pH, using a blend of dyes that cover a wide range. In this scale, blue appears for solutions that are mildly alkaline—pH just above 7 but not very high. A weak alkali has this gentle basicity, so the color you’d see is blue. The other colors fit differently: red to orange to yellow for acids, green around neutral, and purple for strongly alkaline solutions.

Universal indicator shows color changes according to pH, using a blend of dyes that cover a wide range. In this scale, blue appears for solutions that are mildly alkaline—pH just above 7 but not very high. A weak alkali has this gentle basicity, so the color you’d see is blue. The other colors fit differently: red to orange to yellow for acids, green around neutral, and purple for strongly alkaline solutions.

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