Write a note on internal indicator.

Answer»

Internal indicator are the substance which are added in the titration flask at the beginning. Example: Methyl orange, starch, phenolphthalein, diphenylamine.

Internal indicator are further divided according to the type of reaction taking place during titration.

(a) Acid base indicator: The choice of indicator for acid base titration depends on the nature of the acid and base used in that reaction.

Acid Base Indicator

Strong acid Strong base Methyl orange or phenolphthalein

Acid	Base	Indicator
Strong	Strong base	Methyl orange or phenolphthalein

(b) Redox indicator: Example: Diphenylamine. When titrating KMnO₄ with oxalic acid.

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