What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?

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Solution

Phenolphthalein is a synthetic indicator. The neutral colour of phenolphthalein is ‘colourless’.

Phenolphthalein indicator gives pink colour when added to a base or an alkali (such as sodium hydroxide).

Phenolphthalein indicator is colourless in acid solution.

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