Question

When few drops of phenolphthalein are added to 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

phenolphthalein solution turns colourless when it reacts with an acid . As HCL is an acid it will turn phenolphthalein colourless

Answer 2

Answer:

When few drops of phenolphthalein are added to dilute a dilute solution of sodium hydroxide a pink colour. The colour of dilute solution of Sodium hydroxide turns pink or adding Phenolphthalein as  NaOH is a base .When excess of HCl is added the final mixture becomes colourless due to  neutralisation of base with an acid.