Please answer subquestion (D).

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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