Question

What in an indicator? give an example.​

Answer 1

Answer:

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.

hope it helps you

Answer 2

Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline.

Because acidity and alkalinity relate to pH, they may also be known as pH indicators.

Examples of acid-base indicators include 

• litmus paper, 
• phenolphthalein, and
• red cabbage juice.

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