Question

what is an indicator ​

Answer 1

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

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Answer 2

Answer:

An Indicator is a substance that tells about the basic or acidic nature of a substance.

Example: Litmus paper, methyl orange, phnenophtheline, etc.