Question

what is an indicator? write the change in colour of litmus paper and phenolphthalein on potassium hydroxide solution​

Answer 1

Answer:

The litmus paper will remain red. (b) Blue litmus: The blue litmus paper changes to red in the presence of sulphuric acid. (c) Phenolphthalein: Phenolphthalein is an indicator solution which turns colourless in the presence of acids. Therefore, in the presence of sulphuric acid, phenolphthalein turns colourless

Explanation:

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Answer 2

Answer:

An indicator is a substance which indicates the acidic and basic solutions.

litmus paper changes from red to blue colour.

phenolphthalein changes to pink colour