The percent purity of a pharmaceutical zinc oxide drying agent was analyzed using the backtitration method. A 1.30-g sample was dissolved completely in 150. mL of 0.600 M HCI, which reacts as shown below: ZnO (s) + 2 HCl(aq) → ZnCl2(aq) + H2O(1). The inactive components of the drying agent dissolve in water and do not react with HCI. The acidified mixture was diluted to a final volume of 300. mL. A 20.0 mL aliquot was titrated with NaOH. If 9.83 mL of 0.524 M NaOH was needed to neutralize the excess HCI, what is the mass percentage of Zn in the drying agent? In correct significant figures, the answer is
The percent purity of a pharmaceutical zinc oxide drying agent was analyzed using the backtitration method. A 1.30-g sample was dissolved completely in 150. mL of 0.600 M HCI, which reacts as shown below: ZnO (s) + 2 HCl(aq) → ZnCl2(aq) + H2O(1). The inactive components of the drying agent dissolve in water and do not react with HCI. The acidified mixture was diluted to a final volume of 300. mL. A 20.0 mL aliquot was titrated with NaOH. If 9.83 mL of 0.524 M NaOH was needed to neutralize the excess HCI, what is the mass percentage of Zn in the drying agent? In correct significant figures, the answer is
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter4: Reactions In Aqueous Solution
Section: Chapter Questions
Problem 59QAP: In order to determine the purity of ammonium sulfate, a sample with a mass of 0.850 g is dissolved...
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