Question

What are indicators.
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Answer 1

Answer:

substance (as a dye) used to show visually (as by a change in color) the condition of a solution with respect to the presence of a particular material (as a free acid or alkali) litmus and phenolphthalein are acid-base indicators. More from Merriam-Webster on indicator.

Explanation:

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Answer 2

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The substances which help us to know which are acids, which are bases, are called the indicators.

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