Question

how can indicators be classified​

Answer 1

Answer:

There are two types of indicator

1. Natural indicator - Turmeric, Vanilla.
2. Artificial indicator - Litmus paper, Phenolphtalien.

Answer 2

Answer:

indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution. If acid is slowly added, the solution remains yellow until all the alkali has been neutralized, whereupon the colour suddenly changes to red.

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