Question

when few drops of phenolphthalein are added to a dilute solution of sodium hydroxide a pink colour produced what will be the colour of the final mixture when excess of HCL is added to it​

Answer 1

This process is done in titration.NaOH(sodium hydroxide) is a base, phenolphthalein is added and the base turns pink in colour.After titrating out the base by any acid ( drop by drop from the burette) the base gets colourless again.Titration should be in very cautious way, a single drop difference could spoil your whole experiment
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Answer 2

https://www.sarthaks.com/35836/when-a-few-drops-of-phenolphthalein-are-added-to-a-dilute-solution-of-sodium-hydroxide