Question

Two solutions X and Y have Ph values of 4 and 10 respectively. Which one of these two will give a pink colour with phenolphthalein indicator?

Answer 1

The concentration of H⁺_(aq) ions determines if a solution is acidic, alkaline, or neutral.

Solution X, with a pH of 4, is acidic and will not affect the colourless phenolphthalein solution but solution Y, with a pH of 10, is basic and leads the phenolphthalein indicator to change colour to pink.