Question

Mention the colour changes in acidic and basic solutions
S.NO Name of Indicator | Acidic solution | Basic solution | Used for testing
1.
Litmus
2.
Turmeric
3.
China rose
4.
Phenolphthalein
5.
Methyl orange

Answer 1

Turmeric: Turmeric is also used as natural indicator. Turmeric is of yellow colour. Turmeric paper turns into red when it is dipped into basic solution. Turmeric paper does not change its colour with acid.

China Rose: China rose is another natural indicator. China rose solution gives dark pink (magenta) colour with acid and green colour with base.

Acid Rain: Carbon dioxide, sulphur dioxide and nitrogen dioxide which are released from vehicles and chimneys mix with droplets of rain and turn the rain water acidic. When this acidic rain water falls over earth, it is known as acid rain. Acid rain damages the buildings and is harmful for plants and animals.