most of the indicators have auseful indicators colour change over ph of the solution is nearly
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useful indicator has a strong color that changes quickly near its pKa. These traits are desirable, so only a small amount of an indicator is needed. If a large amount of strong acid or base is used, the indicator will affect the final pH, lowering the accuracy of the experiment. The indicator should also have a pKa value near the pH of the titration end point.
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