2. What are the transmission and absorbance of a blank sample? From other substav 3. Using the data at right: CONCENTRATION a. Calculate the absorbance of each sample. You will need to express the %T values as decimals before calculating the logarithms. (ppm) PERCENT TRANSMISSION ABSORBANCE 0 100.0 100 74.1 (e.g., for T = 25%, A = -log 0.25 = 0.602) 200 54.9 C. b. Use the graph paper on the back of this page (or a spreadsheet) to plot absorbance vs. concentration. Make a proper graph, with labeled axes, uniform scales, etc. Use a ruler to draw the best-fit line. Use the graph to find the concentration of the un- known sample. (Draw dotted lines on the graph showing how you found your answer.) 300 40.7 400 30.1 500 22.3 unknown 60.3
2. What are the transmission and absorbance of a blank sample? From other substav 3. Using the data at right: CONCENTRATION a. Calculate the absorbance of each sample. You will need to express the %T values as decimals before calculating the logarithms. (ppm) PERCENT TRANSMISSION ABSORBANCE 0 100.0 100 74.1 (e.g., for T = 25%, A = -log 0.25 = 0.602) 200 54.9 C. b. Use the graph paper on the back of this page (or a spreadsheet) to plot absorbance vs. concentration. Make a proper graph, with labeled axes, uniform scales, etc. Use a ruler to draw the best-fit line. Use the graph to find the concentration of the un- known sample. (Draw dotted lines on the graph showing how you found your answer.) 300 40.7 400 30.1 500 22.3 unknown 60.3
Chapter3: Statistical Tests With Excel
Section: Chapter Questions
Problem 4P
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Transcribed Image Text:2. What are the transmission and absorbance of a blank sample?
From other substav
3. Using the data at right:
CONCENTRATION
a.
Calculate the absorbance of each sample. You will
need to express the %T values as decimals before
calculating the logarithms.
(ppm)
PERCENT
TRANSMISSION
ABSORBANCE
0
100.0
100
74.1
(e.g., for T = 25%, A = -log 0.25 = 0.602)
200
54.9
C.
b. Use the graph paper on the back of this page (or a
spreadsheet) to plot absorbance vs. concentration.
Make a proper graph, with labeled axes, uniform
scales, etc. Use a ruler to draw the best-fit line.
Use the graph to find the concentration of the un-
known sample. (Draw dotted lines on the graph
showing how you found your answer.)
300
40.7
400
30.1
500
22.3
unknown
60.3
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