PART B. Spectrophotometric Determination of the Copper Content of a Penny 3.116 Mass of penny: g 1979 Date on penny: A-l03 17-1/00) Concentration of standard Cu solution: 300 M Volume, Standard Volume, 1 M Cu (mL) [Cu2-] (M) % Transmittance Absorbance 2+ HNO, (mL) (use Eq. 4) 2 00 3,22 3 22 Test tube 1 800 S00 S.00 2.82 Test tube 2 OIS Z.82 &.00 2 2.619 O. 24 Test tube 3 2o19 2.5S 2.55 O.300 Standard 2.60 2.l09 Unknown X - lg - log o.is/iou) log Co.74/100) 73 Concentration of Cu in unknown (penny) O 201 M (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. 128 % 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. O.204 U 250OL O.810 0.0128

PART B. Spectrophotometric Determination of the Copper Content of a Penny 3.116 Mass of penny: g 1979 Date on penny: A-l03 17-1/00) Concentration of standard Cu solution: 300 M Volume, Standard Volume, 1 M Cu (mL) [Cu2-] (M) % Transmittance Absorbance 2+ HNO, (mL) (use Eq. 4) 2 00 3,22 3 22 Test tube 1 800 S00 S.00 2.82 Test tube 2 OIS Z.82 &.00 2 2.619 O. 24 Test tube 3 2o19 2.5S 2.55 O.300 Standard 2.60 2.l09 Unknown X - lg - log o.is/iou) log Co.74/100) 73 Concentration of Cu in unknown (penny) O 201 M (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. 128 % 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. O.204 U 250OL O.810 0.0128

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter6: An Introduction To Spectrometric Methods

Section: Chapter Questions

Problem 6.18QAP

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Concept explainers

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.

Question

are my transmittance and absorbance correct on page 1 and on page 2 how do I find the percentage cu in penny ?

PART B. Spectrophotometric Determination of the Copper Content of a Penny
3.116
Mass of
penny:
g
1979
Date on penny:
A-l03 17-1/00)
Concentration of standard Cu solution:
300 M
Volume, Standard Volume, 1 M
Cu (mL)
[Cu2-] (M) % Transmittance Absorbance
2+
HNO, (mL)
(use Eq. 4)
2 00
3,22
3 22
Test tube 1
800
S00
S.00
2.82
Test tube 2
OIS
Z.82
&.00
2
2.619
O. 24
Test tube 3
2o19
2.5S
2.55
O.300
Standard
2.60
2.l09
Unknown
X
- lg
- log o.is/iou)
log Co.74/100)
73

Concentration of Cu in unknown (penny) O 201 M
(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.
128 %
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.
O.204
U 250OL
O.810
0.0128

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