Natural Indicators

Why does olfactory indicators changes smell along with the substance?

Complete the following table:

The yellow colour of turmeric changes to red on addition of soap solution. When substance P is added to turmeric, there is no change in colour.

Which of the following is definitely true about substance P?

What are indicators?

What will happen if turmeric paper is made in contact with caustic soda solution?

When turmeric paper is placed in contact of HCl, it will_____.

Define olfactory indicators. Give two examples.

If you get a turmeric (haldi) stain on your clothes while eating food, and try to wash it off with soap, the stain becomes red. Why? Find out how to remove haldi stains from clothes.

What is an indicator? Name four commonly used indicators and state their effect on acidic, basic and neutral solutions.

Why does a turmeric stain on a white shirt turn red when washed with soap?

Which is the most commonly used indicator? What is its effect on acidic, basic and neutral solutions.

What is an indicator? Name three indicators.

How can you find the nature of a substance (acid or base) without tasting it?

If a liquid turns blue litmus red, is it an acid, base or salt?

Write true or false. Rewrite the false statements correctly.

Litmus is a naturally occurring indicator.

Write true or false. Rewrite the false statements correctly.

Indicators have different colours in acidic and basic solutions.

Which of these is an indicator?

Lime juice will turn

Define olfactory indicator. Give two examples of it.

Peel a beet root with the help of peeler and cut into small pieces with the help of knife. Take these pieces in a mortar and crush well and obtain extract by adding water. Filter the extract through a filter paper and collect filtrate. Take four transparent glasses and label it as A, B, C, D and write your observation in table given.