Question

i)define acid base indicators ? ii) state the change in colour of the following indicators in acidic and basic solutions : methyl orange and phenolphthalein​

Answer 1

Answer:

i) An acid-base indicator is either a weak acid or weak base that exhibits a color change as the concentration of hydrogen (H+) or hydroxide (OH-) ions changes in an aqueous solution.

ii) Methyl orange

Acidic - Red

Basic - Yellow

Phenolphthalein

Acidic - Colourless

Basic - Pink