If the endpoint is surpassed in a back titration with naoh, will the reported amount of antacid in the sample be too high or too low? explain

too low

Explanation:

Antacids are essentially bases. For the experiment,  the antacid samples are dissolved in an excess acid like HCl, the unneutralized HCl is then back titrated with NaOH of a known concentration.

Moles of antacid is sample = Initial moles of the excess HCl - moles of HCl neutralized by NaOH   (1)

If the end point is surpassed in the  back titration, this implies that the moles of HCl neutralized by the acid will be a higher value. Based on equation (1), this situation would result in a lower value of the moles of antacid in the sample. Hence, amount of antacid in the sample would be too low.

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