Mass of KI tablet 0.425 g Mass of thoroughly dried filter paper 1.462 g Mass of filter paper + precipitate after first drying 1.775 g Mass of filter paper + precipitate after second drying 1.699 g Mass of filter paper + precipitate after third drying 1.698 g A student is given the task of determining the I content of tablets that contain Kl 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 MPb(NO3)2(aq) 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 above. d. Calculate the number of moles of precipitate that is produced in the experiment. e. Calculate the mass percent of I in the tablet. f. In another trial, the student dissolves a tablet in 55.0 mL of water instead of 50.0 mL of water. Predict whether the experimentally determined mass percent of I will be greater than, less than, or equal to the amount calculated in part (e). Justify your answer. g. A student in another lab also wants to determine the | content of a Kl tablet but does not have access to Pb(NO3)2 - However, the student does have access to 0.20 MAGNO3 , which reacts with I (aq) to produce -17 Agl(s). The value of Ksp for Agl is 8.5 x 107. i. Will the substitution of AgNO3 for Pb(NO3)2 result in the precipitation of the l ion from solution? Justify your answer. ii. The student only has access to one Kl tablet and a balance that can measure to the nearest 0.01 g. Will the student be able to determine the mass of Agl produced to three significant figures? Justify your answer.
Mass of KI tablet 0.425 g Mass of thoroughly dried filter paper 1.462 g Mass of filter paper + precipitate after first drying 1.775 g Mass of filter paper + precipitate after second drying 1.699 g Mass of filter paper + precipitate after third drying 1.698 g A student is given the task of determining the I content of tablets that contain Kl 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 MPb(NO3)2(aq) 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 above. d. Calculate the number of moles of precipitate that is produced in the experiment. e. Calculate the mass percent of I in the tablet. f. In another trial, the student dissolves a tablet in 55.0 mL of water instead of 50.0 mL of water. Predict whether the experimentally determined mass percent of I will be greater than, less than, or equal to the amount calculated in part (e). Justify your answer. g. A student in another lab also wants to determine the | content of a Kl tablet but does not have access to Pb(NO3)2 - However, the student does have access to 0.20 MAGNO3 , which reacts with I (aq) to produce -17 Agl(s). The value of Ksp for Agl is 8.5 x 107. i. Will the substitution of AgNO3 for Pb(NO3)2 result in the precipitation of the l ion from solution? Justify your answer. ii. The student only has access to one Kl tablet and a balance that can measure to the nearest 0.01 g. Will the student be able to determine the mass of Agl produced to three significant figures? Justify your answer.
Chemistry
10th Edition
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Mass of KI tablet
0.425 g
Mass of thoroughly dried filter paper
1.462 g
Mass of filter paper + precipitate after first drying
1.775 g
Mass of filter paper + precipitate after second drying
1.699 g
Mass of filter paper + precipitate after third drying
1.698 g
A student is given the task of determining the I content of
tablets that contain Kl 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 MPb(NO3)2(aq) 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 above.
Transcribed Image Text:d. Calculate the number of moles of precipitate that is
produced in the experiment.
e. Calculate the mass percent of I in the tablet.
f. In another trial, the student dissolves a tablet in 55.0
mL of water instead of 50.0 mL of water. Predict
whether the experimentally determined mass percent
of I will be greater than, less than, or equal to the
amount calculated in part (e). Justify your answer.
g. A student in another lab also wants to determine the
| content of a Kl tablet but does not have access to
Pb(NO3)2 - However, the student does have access to
0.20 MAGNO3 , which reacts with I (aq) to produce
-17
Agl(s). The value of Ksp for Agl is 8.5 x 107.
i. Will the substitution of AgNO3 for Pb(NO3)2
result in the precipitation of the l ion from
solution? Justify your answer.
ii. The student only has access to one Kl tablet
and a balance that can measure to the nearest
0.01 g. Will the student be able to determine the
mass of Agl produced to three significant
figures? Justify your answer.
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