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Blue litmus paper is dipped in a solution, it remains blue what is its nature?
A solution which does not change the colour of blue litmus paper can be either basic or neutral in nature. Test: The nature of the solution can be confirmed by placing a drop on red litmus paper. Observation: If the colour change to blue then the solution is basic and if no colour change is observed, the solution is neutral in nature. [Recapitulation: Litmus is a natural indicator and is used to test materials for acidity and basicity. This solution can also be used to differentiate between acids and bases. When acid is added to a litmus solution, it changes to red. When a base is added, it changes to blue. Neutral litmus paper is purple in colour. A natural Indicator is a type of indicator that can be found naturally and can help us to know whether the material tested is an acidic substance or a basic substance. Some examples of natural indicators other than litmus are: red cabbage, turmeric, turnip skin, curry powder, etc.]
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