Q.

A standard HCl solution is titrated to a pink phenolphthalein end point 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 colour?

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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

answer is B.

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A standard HCl solution is titrated to a pink phenolphthalein end point 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 colour?