Question

When few drops of phenolphthalein are added to a dilute solution of sodium hydroxide a pink colour is produced.

What will be the colour of the final mixture when excess of HCl is added to it? (justify your answer)

Answer 1

lightest pink is the answer

Answer 2

When phenolphthalein is added to dil. NaOH ,the solution turns into pink colour . So, when HCl is added to that solution, It will turn the solution into colourless solution . This is because, HCl neutralises the NaOH and produces salt. Also, as the solution is now neutralised, phnolphthalein will be colourless. Also, following reaction can referred ::-

HCl (aq) + NaOH (aq) -------> NaCl (s) + H₂O (l)

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