Question

write any 10 natural indicators and their uses​

Answer 1

Answer:

We know about Acids and Bases . But how do we determine whether a substance is acidic or basic? We have Natural Indicators around us. You probably have a natural indicator in your home right now. Let us find out more about the natural indicators around us.

Explanation:

• The indicators that are obtained from plants are known as natural indicators.
• Examples – Turmeric, china rosa, red cabbage and grape juice.
• Some flowers such as the hydrangeas can also determine whether a substance is acidic or basic. Hydrangeas turn blue if the soil is acidic, purple if the soil is neutral and pink if the soil is basic. The colour intensity depends on the amount of acid and base present in the soil.
• Universal indicators are a mixture of organic dyes that give different colours at different concentrations of hydrogen ions in solution.

Answer 2

Natural Indicator is a type of indicator that can be found naturally and can determine whether the substance is an acidic substance or a basic substance. Some examples of natural indicators are red cabbage, turmeric, grape juice, turnip skin, curry powder, cherries, beetroots, onion, tomato, etc.

Some flowers like hydrangeas can determine the acidity or basicity of the soil. These flowers become blue if the soil is acidic, purple if the soil is neutral and pink if the soil is basic. The intensity of the color depends on the amount of acid or base present in the soil. Soil which is highly acidic bears deep blue flowers, whereas soil which is highly basic yields deep pink flowers.

These natural indicators are used to detect the hydrogen ions (H+) and hydroxyl ions (OH-) in a solution. Olfactory indicators can change their odor. Some examples of olfactory indicators are onion, vanilla extract, clove oil, etc