The pink colour of phenolphthalein in an alka | vedclass

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Question

(A) In an alkaline medium,phenolphthalein undergoes a structural change where it loses a proton to form a dianion. This dianion is a conjugated system

Vedclass · Accepted Answer

Negative ion

Vedclass · Answer

(A) In an alkaline medium,phenolphthalein undergoes a structural change where it loses a proton to form a dianion. This dianion is a conjugated system that absorbs light in the visible region,resulting in the characteristic pink colour. Therefore,the pink colour is due to the formation of the negative ion (dianion) of phenolphthalein.

The pink colour of phenolphthalein in an alkaline medium is due to -

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