Please answer subquestion (D).

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
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Problem 14.74QE: Lead poisoning has been a hazard for centuries. Some scholars believe that the decline of the Roman...
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Please answer subquestion (D).
4. A student is given the task of determining the I content of tablets that contain
KI and an inert, water-soluble sugar as a filler. A tablet is dissolved in 50.0 mL of distilled water, and an excess of 0.20
M Pb(NO3)2(ag) is added to the solution. A yellow precipitate forms, which is then filtered, washed, and dried. The data
from the experiment are shown in the table below.
0.425 g
Mass of KI tablet
1.462 g
Mass of thoroughly dried filter paper
1.775 g
Mass of filter paper + precipitate after first drying
Mass of filter paper + precipitate after second drying
1.699 g
Mass of filter paper + precipitate after third drying
1.698 g
(a) Write the balanced chemical reaction that occurs above when the precipitate forms,
(b) Explain the purpose of drying and weighing the filter paper with the precipitate three times.
(c) Calculate the number of moles of precipitate that is produced in the experiment.
(d) Calculate the percent composition of I'in the tablet.
Transcribed Image Text:4. A student is given the task of determining the I content of tablets that contain KI and an inert, water-soluble sugar as a filler. A tablet is dissolved in 50.0 mL of distilled water, and an excess of 0.20 M Pb(NO3)2(ag) is added to the solution. A yellow precipitate forms, which is then filtered, washed, and dried. The data from the experiment are shown in the table below. 0.425 g Mass of KI tablet 1.462 g Mass of thoroughly dried filter paper 1.775 g Mass of filter paper + precipitate after first drying Mass of filter paper + precipitate after second drying 1.699 g Mass of filter paper + precipitate after third drying 1.698 g (a) Write the balanced chemical reaction that occurs above when the precipitate forms, (b) Explain the purpose of drying and weighing the filter paper with the precipitate three times. (c) Calculate the number of moles of precipitate that is produced in the experiment. (d) Calculate the percent composition of I'in the tablet.
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