Question

Name three natural Acids and Bases indicators.
√ Elaborate
√ Best answer will be chosen Brainliest
√ Come on brainliest!!

Answer 1

Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases.
Base -a compound that reacts with an acid to form a salt, as ammonia,calcium hydroxide, or certain nitrogen-containing organiccompounds.
Some Natural Indicators are red Cabbage juice,turmeric,china rose[hibiscus] and litmus.
Pour some soup water in some turmeric.We can observe that the colour of turmeric changed to Red.Turmeric remains yellow when acid is added and turns red when base is added.Litmus is available in strips,it turns red when acid is added and turns blue when base is added.You can prepare China rose indicator by boiling water with china rose petals.

Answer 2

1) litmus- it is obtained from the lichens. It is of two colours I.e. blue and red. when blue litmus is placed in acid it's turns red( no change in red litmus) and when red litmus is placed in a base it turns blue( no change in blue litmus).

2) phenolphthalein- when an acid is added to a phenolphthalein solution its colour doesn't change while when a base is added it turns pink. it's due to change in equilibrium of solution.

3) turmeric- it doesn't change its colour in acidic environment but turns red on encounter with a base.

metanil yellow, metanil red, pH paper etc can work as indicators too.