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The main thing about indicators is that they cause the solution you are titrating to change color when you reach the stoichiometric point of a titration. There's a bunch of different indicators with different pKln values and you have to strategically select an indicator that has a pKIn value that is closest to the pH at the stoichiometric point of a titration. For example, titrating CH3COOH with NaOH results in a pH of about 9 at the stoichiometric point. As a result, using a phenolphthalein indicator (turns from clear to a really pale pink at the stoichiometric point, but becomes really dark purple if you put too much base in) would be most effective in determining when you have added enough NaOH to complete the titration.
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