Question

a drop of phenolphthalein is added to lime water

Answer 1

If a drop of phenolphthalein is added to lime water ( that is calcium hydroxide ) then the solution will turn colourless to pink colour showing that the lime water is basic in nature.

Answer 2

Explanation:

Lime water is a base, so when the phenolphthalein was added to the solution, it turned the solution pink. When I exhaled into the solution, the carbon dioxide in a person's breath reacted with the water to form Carbonic Acid.