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A standard HCl solution is titration to ...

A standard HCl solution is titration to a pink phenolphtalein endpoint by adding NaOH solution while stirring. If a solution becomes pink throughout but loses its colour upon standing for a short time, what should be done to restore the coloure ?

A

Add more phenolphthalein indicator

B

Add an additional drop of NaOH solution

C

Add an additional drop of HCl solution.

D

Stir more vigorously.

Text Solution

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The correct Answer is:
b
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