Concentration of Cu in unknown (penny) = (from calibration curve) Mass of Cu in sample (penny) = Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L). To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample. %3D Percent Cu in penny =
Concentration of Cu in unknown (penny) = (from calibration curve) Mass of Cu in sample (penny) = Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L). To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample. %3D Percent Cu in penny =
Chapter12: Spectrochemical Methods
Section: Chapter Questions
Problem 10P
Related questions
Question
![PART B. Spectrophotometric Determination of the Copper Content of a Penny
Mass of penny: 3.1848
Date on penny: 1964
Concentration of standard Cu2 solution:
M
Volume, Standard Volume, 1 M
[Cu] (M) % Transmittance Absorbance
Cu (mL)
HNO, (mL)
(use Eq. 4)
2.
O.06
84.3%
Test tube 1
0-074
O.IS
60.95% 0.215
Test tube 2
8.
3
0 244
45.3%
0.344
Test tube 3
300M
33.65%
Standard
O.473
Unknown
52.822
0-277](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1e5f9f3c-b82d-4447-83ca-35fd6dd3bebe%2F1e6c6185-9c63-4d64-bc90-6f2079c5da1f%2F2h445wb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:PART B. Spectrophotometric Determination of the Copper Content of a Penny
Mass of penny: 3.1848
Date on penny: 1964
Concentration of standard Cu2 solution:
M
Volume, Standard Volume, 1 M
[Cu] (M) % Transmittance Absorbance
Cu (mL)
HNO, (mL)
(use Eq. 4)
2.
O.06
84.3%
Test tube 1
0-074
O.IS
60.95% 0.215
Test tube 2
8.
3
0 244
45.3%
0.344
Test tube 3
300M
33.65%
Standard
O.473
Unknown
52.822
0-277
Transcribed Image Text:Concentration of Cu in unknown (penny) =
(from calibration curve)
%3D
Mass of Cu in sample (penny) =
Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L).
To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done
by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying
the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample.
Percent Cu in penny =
Remember that percent by mass is simply the mass of Cu in the sample divided by the total mass
of the sample (x 100%).
Show your calculations in the space below. Attach the calibration curve to this page.
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