Question

Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colorless to pink?

Answer 1

• Solution A is acidic in nature because it has a pH of 3.0 (pH less than 7) and thus, it will turn litmus solution from blue to red.
• The solution B is basic in nature because it has a pH of 9.5 (pH greater than 7) and thus, it will turn phenolphthalein from colourless to pink.