4. A student was performing this experiment with an antacid tablet which contained CaCO3 but forgot to heat the antacid solution prior to starting the titration. As sodium hydroxide was added the student noticed the formation of an insoluble white precipitate. a. Identify the precipitate. (Hint: the precipitate was soluble under acidic conditions) b. Would the presence of this precipitate cause the students experimentally determined volume of NaOH, required for the back-titration, to be incorrectly high or incorrectly low? Briefly explain. c. Would the resulting calculated number of moles of HCl, neutralized by the antacid tablet, be incorrectly large or small? Briefly explain.
4. A student was performing this experiment with an antacid tablet which contained CaCO3 but forgot to heat the antacid solution prior to starting the titration. As sodium hydroxide was added the student noticed the formation of an insoluble white precipitate. a. Identify the precipitate. (Hint: the precipitate was soluble under acidic conditions) b. Would the presence of this precipitate cause the students experimentally determined volume of NaOH, required for the back-titration, to be incorrectly high or incorrectly low? Briefly explain. c. Would the resulting calculated number of moles of HCl, neutralized by the antacid tablet, be incorrectly large or small? Briefly explain.
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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4. A student was performing this experiment with an antacid tablet which contained CaCO3
but forgot to heat the antacid solution prior to starting the titration. As sodium
hydroxide was added the student noticed the formation of an insoluble white
precipitate.
a. Identify the precipitate. (Hint: the precipitate was soluble under acidic conditions)
b. Would the presence of this precipitate cause the students experimentally
determined volume of NaOH, required for the back-titration, to be incorrectly high
or incorrectly low? Briefly explain.
c. Would the resulting calculated number of moles of HCl, neutralized by the antacid
tablet, be incorrectly large or small? Briefly explain.
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