This educational film explores acid-base indicators and their color changes in response to acidity. It demonstrates how substances like tea, red cabbage, and litmus paper react when acids are ...

An indicator changes color when it encounters an acid or base. There are many different types of indicators, some that are liquids and others that are concentrated on little strips of "litmus" paper.

You have only turmeric indicator. ⇒ Blue litmus paper is dipped in a solution. ... If an indicator changes colour with a base, it does not change colour with an acid. (d) ...