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Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
The nature of the solution can be:
- Bases change the colour of litmus paper to blue. As the colour of blue litmus paper is not affected, the solution must be basic.
- If the solution is neutral, even the colour of the litmus will not change.
[Extra information:
Litmus is a natural indicator. 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. It is obtained from lichens. The process of obtaining a litmus solution needs the crushing and grinding of lichens.
Some examples of natural indicators other than litmus are: red cabbage, turmeric, turnip skin, curry powder, etc.
Use:
It 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.
]
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