To make a calibration curve, the Molarity in the x-axis is plotted against the absorbance in the y-axis. See graph below. Absorbance 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Calibration Curve y=4341.5x+0.0873 R²=0.9904 0 0 0.00002 0.00004 0.00006 0.00008 0.0001 0.00012 0.00014 0.00016 0.00018 Molarity (M)

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 6P
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a) The absorbance measured of 0.350, mixed with a concentration of unknown. solution of equilibrium.  What is the concentration of the solution?

 

b) Calculate the Kf of the equilibrium reaction if the initial concentration of ions was [Fe^3+] = 1.00 x 10^-3 M and [SCN^-] = 4.00 x 10^-4 M using the equilibrium concentration corresponding with the absorbance of 0.350

To make a calibration curve, the Molarity in the x-axis is plotted against the absorbance in the y-axis. See graph below.
Absorbance
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Calibration Curve
y=4341.5x+0.0873
R²=0.9904
0
0
0.00002
0.00004
0.00006
0.00008
0.0001
0.00012
0.00014
0.00016
0.00018
Molarity (M)
Transcribed Image Text:To make a calibration curve, the Molarity in the x-axis is plotted against the absorbance in the y-axis. See graph below. Absorbance 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Calibration Curve y=4341.5x+0.0873 R²=0.9904 0 0 0.00002 0.00004 0.00006 0.00008 0.0001 0.00012 0.00014 0.00016 0.00018 Molarity (M)
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