Question

Answer the following in brief :
1. What is an indicator? Give two examples along with their action​

Answer 1

Answer:

Indicators are the chemical or natural substances that are used to test whether a substance is acidic or basic.

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Answer 2

Explanation:

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.

Certain naturally occurring substances can also act as indicators as they change colour according to the nature of substance. Example: Red cabbage juice. The other indicators used are litmus, methyl orange and phenolphthalein.