Phenolphthalein is an indicator which turns a pink color at a pH of 8.3. In this experiment, phenolphthalein is added to the antacid solution to indicate the equivalence point of the back titration.  Phenolphthalein solution by itself is weakly acidic.  If instead of adding one drop, a student adds several milliliters of the phenolphthalein solution, will this cause the student to under-estimate or over-estimate the neutralizing power of the antacid?  Explain your answer.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 32QRT: The titration curves for two acids with the same base are shown on this graph. (a) Which is the...
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  1. Phenolphthalein is an indicator which turns a pink color at a pH of 8.3. In this experiment, phenolphthalein is added to the antacid solution to indicate the equivalence point of the back titration.  Phenolphthalein solution by itself is weakly acidic.  If instead of adding one drop, a student adds several milliliters of the phenolphthalein solution, will this cause the student to under-estimate or over-estimate the neutralizing power of the antacid?  Explain your answer.  
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