Question

Kushal added a few drops of Phenolphthalein to liquid Y in a beaker and observed that the
solution changed to pink colour. Next he added excess of Vinegar to the same solution and
found that the pink colour solution changed to a colourless solution.

Answer 1

each of which is on the same side of one of two lines cut by a transversal and on the same side of the transversalAny pair of angles each of which is on the same side of one of two lines cut by a transversal and on the same side of the transversal

Answer 2

""" ❤️ Answer ❤️ """

Acid + Base → Salt + Water

Phenolphthalein, being a chemical indicator, giver pink colour in basic solutions and gets colourless in acidic solutions. Upon the addition of HCl to the NaOH solution leads to the reaction of neutralisation,

NaOH+ HCl→ NaCl+

H

2

But upon addition of excess of HCl makes the solution acidic hence, the solution gets colourless at the end of the experiment.