Percentage Error Cuvette
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Before Lab Before coming to lab, complete your prelab, including the objective, reference, three prelab problems, procedure, and sample calculations or analysis flowchart. The latter should include the calculation of the molar extinction coefficient from the Beer's Law plot, the determination of the % https://www.dartmouth.edu/~chemlab/chem6/cobalt2/full_text/write-up.html Co by mass in your sample, and the % H2O by mass in your sample. During Lab Keep careful records of your observations and any deviations from the prelab procedure. For the Beer's Law test, you should plot absorbance vs. concentration, as you measure it. The extinction coefficient of [Co(SCN)4]-2 at 625 nm should be calculated from the slope of the data. A value of about 1800 M-1 cm-1 should be obtained, using a path percent error length of 1.17 cm for the colorimeter cuvettes. As you record and plot the data, use a ruler to get an approximate slope and extinction coefficient. For your formal report, perform a least squares analysis to determine the molar extinction coefficient more accurately. A typical Beer's Law Plot is shown in Figure 3. Figure 3 Beer's Law Plot of [Co(SCN)4]2- in aqueous acetone After Lab You will present your results, data and conclusions this week in percentage error cuvette the form of a formal report. Please prepare a word-processed document including a title page, objective, reference, results, calculations and a discussion. In preparing your formal report, please address the following: Your Beer's Law plot, completed by determining the slope using a least squares analysis. Use the Least Squares program available on the ChemLab website. Be sure to record the 95% confidence interval in the slope, for your uncertainty analysis. A calculation of the extinction coefficent of Co(SCN)42- at 625 nm and the concentration of your sample solution, from the Beer's Law calibration plot. A calculation of the weight percent cobalt in the sample from the result of your analysis and a comparison with the theoretical value calculated from the molecular formula. A direct comparison of these two values will give an indication of the purity of your compound. An uncertainty analysis, as described below. The calculation of the percent cobalt by mass is a straight forward application of the principles described in the introduction, but the dilution factors can be tricky. A similar example is worked out below to guide your calculation. Example. A 40.8 mg sample of [Co(NH3)5 (H2O)][NO3]3 was weighed and subjected to colorimetric cobalt analysis. Unlike the procedure you used, the total volume of the first solutions was 50 mL. Duplicate samples of 4 mL were then ta
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