Question

Theories of acid base indicator

Answer 1

Answer:

The Theory of Acid–Base Indicators:

According to this theory, a hydrogen ion indicator is a weak organic acid or base. ... On other hand, when the solution is alkaline, that is, when OH- ions present in excess, the H+ ions furnished by the indicator will be taken out to form

undissociated water.

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Answer 2

Answer:

Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions. Consider an indicator which is a weak acid, with the formula HIn.