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why is it important that you add phenolphthein indicator solution to the vinegar solution prior to beginning the titrati

3. In Part IV of the Procedure, you added 6M HCl to the Discarded Solutions beaker containing excess NaOH solution. HCl react
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An indicator like phenolphthalein is used to ensure the completion of the reaction, to determine the endpoint precisely. in acidic medium phenolphthalein is colourless so it is added at the beginning before starting the titration so that when in excess of NaOH is present in the the titration mixture we should get to know that reaction has completed and the endpoint has reached so that the exact concentration of the unknown solution Could be determined.

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