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Why can phenolphthalein be used as indicator?

indicator phenolphthalein Used
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Why can phenolphthalein be used as indicator?

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Ulex replies Phenolphthalein changes colour in the range of pH 8-9, which is within range for the titration of a strong acid (HNO3) with a strong alkali (NaOH). There is no good reason why it should not be used in this experiment.

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