Question

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Volume of K2Cr04 (mL) Absorbance Molar concentration of CrO42- (M) 2.4 x 10-5 1.00 0.89 5.00 1.2*10^-4 0.55 10.00 2.4*10^-4 0.99 15.00 3.6*10^-4 1.37 QUESTION 3 10 points Save Answer Upload the plot of the standard curve. Use excel to construct it. Label the axes and draw the linear relationship. Show the equation of the line on the plot (at the top right away from the data points). Do not label the data points Hint: Once you construct the calibration plot, copy it to a word document to be converted to a PDF and attach the PDF file only. Attach File Browse My Computer QUESTION 4 3 points Save Answer Using the calibration plot and the equation for the line, calculate the average molar extinction coefficient? Assume that the path length is 1 cm.

Answer 1

Question 4:

Absorbance Vs. Concentration Plot Equation: A=ecl y = 4046.8x 0.00005 0.0001 0.0003 0.00035 0.0004 0.00015 0.0002 0.00025 Molar Concentration (M)

Average Molar extinction coefficient = 4046.8 (From Graph)

Concentration Absorbance (C) (A) 0.000024 0.89 0.00012 0.55 0.00024 0.99 0.00036 1.37 Molar Extinction coefficient (E=A/cl) 37083.33333 4583.333333 4125 3805.555556 Average=12399.30556