Question

give examples for natural indicators

Answer 1

Indicators :

Indicators are chemical compounds that tell us whether a substance is acidic or basic by changing its colour. When added to an acidic solution or a basic solution, indicators change their colour and this change in colour is different for the acids and bases. The indicator thus help us to decide whether a given solution is acidic or basic in nature.

The indicators that are obtained from plants are known as natural indicators.

Examples – Turmeric, china rosa, red cabbage and grape juice.

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Answer 2

an acid (e.g. vinegar, lemon juice), purple in an alkali (e.g. bicarbonate of soda, bleach) and green in something that is neutral (e.g. water). Many plants contain their own indicators – turmeric, red cabbage juice and beetroot juice are three good examples. Other examples are tea and red grape juice.