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Describe three characteristics of a good acid base indicator

Describe three characteristics of a good acid base indicator

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Answer #1

Acid Base indicators:

The chemical substances which are used to detect the end point in acid base titrations are called "acid base indicators".

Ex: Methyl orange, Methyl red, Phenolpthalene, etc.

A substance which exhibits one colur in acidic solution & different colour in basic solution is called an indicators.

All the indicators are weak organic acids or weak organic bases.

Ex:

1) Phenapthalein is a weak acid. It act as acid base indicator. Phenaptalein is colourless in acedic medium and exhibits pink colour in basic medium.

2) Methyl orange is a weak base. It act as acid base indicator. Methyl orange is pink colour in acedic medium and yellow colour in basic medium.

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