WebAssign for Zumdahl/Zumdahl/DeCoste's Chemistry, 10th Edition [Instant Access], Single-Term
10th Edition
ISBN: 9781337909969
Author: Zumdahl; Steven S.
Publisher: Cengage Learning US
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Textbook Question
Chapter 1, Problem 100AE
The active ingredient of aspirin tablets is acetylsalicylic acid, which, has a density of 1.4 g/cm3. In a lab class, a student used paper chromatography to isolate another common ingredient of headache remedies. The isolated sample had a mass of 0.384 g and a volume of 0.32 cm3. Given the data in the following table, what was the other ingredient in the headache remedy?
Density Values for Potential Headache Remedies
Compound | Density (g/cm3) |
White table sugar | 0.70 |
Caffeine | 1.2 |
Acetylsalicylic acid | 1.4 |
Sodium chloride | 2.2 |
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II.
BOILING POINT ELEVATION:
The temperature of a boiling 50 mL of distilled water in an Erlenmeyer flask with a small
flame was taken to be 98°C. The bulb of the thermometer must not touch the bottom or sides
of the Erlenmeyer flask.
In another Erlenmeyer flask, 2.83 grams of urea is dissolved in 10 grams of distilled water. The
solution was let to boil gently and its boiling point was recorded to be 101°C.
DATA AND RESULTS: (Show all pertinent computations on the space provided if applicable.
Answers with no computation will not be considered.)
Mass of urea in grams
Mass of water in grams
Boiling point of distilled water in degrees
Celsius
Boiling point of urea solution in degrees
Celsius
Molecular weight of urea in g/mol
(experimental)
Molecular weight of urea in g/mol
(calculated)
Percent Error of Molecular weights of urea
Change in boiling point
SOLUTION/S:
While creating a piece of art work, a student becomes curious about the ink he is using to create his art. He wonders if the in
is a pure substance or a mixture. The ink appears to be uniform throughout, but separates when a chromatography experimer
is performed on it, leaving multiple marks of different colors along the chromatography paper.
Using his observations of the properties of the ink, the student can classify it as a
heterogeneous mixture.
solution.
compound.
element.
A student dissolves a Jefferson nickel to make 100.00 mL
of solution in a volumetric flask. The student takes a
5.00 mL aliquot of the first solution and dilutes it to make
100.00 mL of a second solution. The student places a
sample of the second solution in a cuvette for analysis
using spectrophotometry.
The molarity of the copper solution in the cuvette was
determined by spectrophotometric analysis to be
2.90 x 10-2 M Cu. Calculate the mass of copper in the
Jefferson nickel used to make the first solution.
Use the diagram to help visualize the dilution process.
WE
IN GOD
TRUST
100 mL
LIBERTY 200
5 mL
100 mL
cuvette
Chapter 1 Solutions
WebAssign for Zumdahl/Zumdahl/DeCoste's Chemistry, 10th Edition [Instant Access], Single-Term
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