What color does universal indicator show in a strong acid?

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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 does universal indicator show in a strong acid?

Explanation:
Universal indicator changes color according to how acidic or basic a solution is, which means it reflects the pH value. A strong acid has a very low pH, around 1–2, and the color corresponding to such low pH values on the universal indicator scale is red. As solutions become less acidic and more basic, the color shifts through orange, green (near neutral), blue, and finally purple for strong bases. So red is the color you’d expect to see with a strong acid.

Universal indicator changes color according to how acidic or basic a solution is, which means it reflects the pH value. A strong acid has a very low pH, around 1–2, and the color corresponding to such low pH values on the universal indicator scale is red. As solutions become less acidic and more basic, the color shifts through orange, green (near neutral), blue, and finally purple for strong bases. So red is the color you’d expect to see with a strong acid.

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