Question

3. Red litmus turns blue in the presence of​

Answer 1

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• Base changes red litmus to blue.

The litmus is a natural indicator. It is a purple dye which is obtained from lichens which are the thallophytes. It is generally found in the laboratories in strips of paper known as litmus strips which are available in both red and blue colour. The litmus solution is applied on paper in the form of strips. The red litmus strip is for indicating the base and the blue one is for the acids. When a red litmus strip is dipped in basic solution, it turns blue. And when blue litmus strip is dipped in acidic solution, it turns red. In this way, this indicator helps in the identification of acids and bases on the basis of change in colour.

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Indicators are chemical compounds which indicates the presence of acidic, basic or neutral substance by change of colour or odour(smells). Thd indicators are of two types:

• Natural Indicators- Red cabbage, China Rose, Turmeric, Petals of Hydrangea, Petunia. These show change in colour. Onion, Clove oil, Vanilla extract which show change in odour.
• Artificial Indicators- Phenopthalein, Methyl orange, Our universal indicator(pH scale).

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• A chart showing the different change in colour in acidic, basic, and neutral solutions in various Indicators.

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Answer 2

Explanation:

base

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