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: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter14: Acid- Base Equilibria
Section: Chapter Questions
Problem 114CP: Consider the following two acids: In two separate experiments the pH was measured during 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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