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Acid-Base Indicator Definition

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Red cabbage juice can be used to test the pH of common household chemicals.

Red cabbage juice can be used to test the pH of common household chemicals. From left to right, the colors result from lemon juice, natural red cabbage juice, ammonia, and laundry detergent.

Anne Helmenstine

Acid-Base Indicator Definition: An acid-base indicator is either a weak acid or weak base that exhibits a color change as the concentration of hydrogen (H+) or hydroxide (OH-) ions changes in an aqueous solution.

Also Known As: pH indicator

Examples: Thymol Blue, Phenol Red and Methyl Orange are all common acid-base indicators. Red cabbage can also be used as an acid-base indicator.

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