Question

A substance that changes color in the presence of an acid or base is called a(n)

Answer 1

The answer is an indicator, an organic substance that change color in the presence of an acid or a base.

Answer 2

Indicator

Explanation:

• An indicator is a substance which changes its color in the presence of acid or base. It is indicative of acid and base in the solution.
• An indicator is used in chemical laboratory.
• An indicator is used in the titration process of the solutions to indicate the completion of the acid-base related reactions.
• An universal indicator is a combination of indicators, this undergoes a gradual change in color in wide pH range. The pH of the solution can be determined by few drops of universal indicator when mixed with the solution.
• Examples of indicator includes the phenolphthalein , methyl orange, turmeric and others.

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