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