Answer to Question #202995 in General Chemistry for Mickayla

Question #202995

An indicator is weak acid (or base) having a conjugate base (or acid) with a significantly different colour. For the titration of a weak base, how would you choose an appropriate indicator?

1)Choose an indicator that has a pKb close to pKb of the base

2)Choose an indicator which changes colour anywhere in the pH range 0-7

3)Choose an indicator that has a pKa close to pKb of the base

4)Choose an indicator with a pKclose to the pH of the titration at equivalence

5)Choose an indicator with a pKa close to the pH of the titration at equivalence

Expert's answer

Acid-base indicators, the Substances such as phenolphthalein, which can be used to determine the pH of a solution.

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