Answered: Absorbance Concentration slope (m)…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter24: Introduction To Spectrochemical Methods

Section: Chapter Questions

Problem 24.2QAP

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For my lab I had to find the unknown concentration of a solution. I found wavelength max of the potassium chromate. Then used that max to find the absorbtion for my sample dilutions. Based on my attached graph. Is my unknown concentration # making sense? Or did I make an error with the absorbance I wrote down in the lab. I did my calculations when I got home. They are correct, but my unknown concentration amount doesn't look like it will even be on the graph. Or am I wrong. Please advise and explain. Thank you

Absorbance
Concentration
slope (m)
2528.2
Intercept (c)
0.0253
0.0002
0.495655377
0.00015
0.45258486
0.0001
Absorbance of unknown sample
0.262383057
0.040399
Concentration of unknown sample
0.00005
0.179808907
5.97223E-06
0.6
y = 2528.2x+ 0.0253
R? = 0.9683
0.5
0.4
0.3
0.2
0.1
0.00005
0.0001
0.00015
0.0002
0.00025
Concentration (M)
Absorbance

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