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2- Graph the collected data (on graph paper and on excel) to determine concentration of the unknown solution and attach both graphs to this packet. Calculate the R'on excel. Did you remember to label the axis correctly with units? Concentration of unknown found from graph, show this on the graph clearly: 3- Assuming the reference value for concentration of the unknown is 1.50 M, calculate % error and explain sources of possible error below. Absorbance of anknown Solution 0.726A % error: 4- a) Explain the pattern observed for the data collected in Procedure D. b) Estimate the absorbance of a solution with a concentration of 1.10 M by the method of extrapolation. Explain how you found this value. 1
B1:B6 1 2 3 4 5 6 7 8 9 10 11 12 File Edit View Insert Format Format Data 100% $ % % -0.00 - fx Absorbance A B C Concentration Absorbance 1.00 m 0.954 A 0.50 m 0.353 A 0.25 m 0.171 A 0.10 m 0.055 A unknown 0.726 A
Concentration Absorbance 1 0.5 0.25 0.1 unknown 0.954 0.353 0.171 0.055 0.726 1.00 0.75 0.50 0.25 0.00 0,2 Absorbance 0.4 Trendline for Absorbance R² = 0.986 0.6 0.8 1.0 ***