In a weak acid, the color of universal indicator is which?

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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

In a weak acid, the color of universal indicator is which?

Explanation:
Universal indicator shows how acidic a solution is by color. A weak acid doesn’t fully dissociate in water, so it produces fewer hydrogen ions than a strong acid of the same concentration. That means its pH is higher (less acidic) than a strong acid, but still acidic. On the universal indicator scale, mildly acidic solutions appear orange, which corresponds to a pH around 3–4. So a weak acid would give an orange color rather than red (very strong acid) or green (near neutral) or blue (basic).

Universal indicator shows how acidic a solution is by color. A weak acid doesn’t fully dissociate in water, so it produces fewer hydrogen ions than a strong acid of the same concentration. That means its pH is higher (less acidic) than a strong acid, but still acidic. On the universal indicator scale, mildly acidic solutions appear orange, which corresponds to a pH around 3–4. So a weak acid would give an orange color rather than red (very strong acid) or green (near neutral) or blue (basic).

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