Question

what is a Indicator

Answer 1

any thing or any substance which indicate something is known as their indicators

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

indicators are substances that have different colours in acids and bases