Table 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2.-690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the value. Insert your labeled graph in the space below. 2

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Table 2: Absorbance Values of Standards and Unknowns.
Sample
Blank
Standard Solution 1
Standard Solution 2
Standard Solution 3
Standard Solution 4
Standard Solution 5
Water Sample 1
Water Sample 2
Phosphate Concentration
(in ppm)
Y17
0 ppm
0.02 ppm
0.04 ppm
0.08 ppm
0.16 ppm
0.32 ppm
Freeman Lake
0.001
0.325
0.292
0.413
0.315
0.039
0.054
0.049
Absorbance at
2= 690 nm
Calculations:
1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your
x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes
on the graph and provide the curve with a title. Use a linear trendline to generate a best fit
line to your data. Label the graph with the equation and the R" value. Insert your labeled
graph in the space below.
X
Transcribed Image Text:Table 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2= 690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the R" value. Insert your labeled graph in the space below. X
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