Question

When few dropa of phenophthalein solution 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 added to it give you observation?

Answer 1

When excess of HCl is added, the colour of the final mixture will be colourless because the pink colour of sodium hydroxide is neutralised with the acid.

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.