Chem 103 Project Lab Essay examples

Words: 1385
Pages: 6

The data gathered and calculated in the experiment accurately portrayed the way the reactions would have taken place. The chloride analysis was a little bit off from other groups due to the fact that our AgCl was in clumps, creating less surface area, thus our product took longer to burn and may not have burned correctly compared to other groups; yet there are several experimental factors that could have caused us to have different results than other groups, i.e. different measurements for samples. Our sources of error could have included eye measurement error, timing of set solutions error, measurement errors, and small calculation errors. Among other variables, the calibration of the analytical balance and spectrophotometer could have …show more content…
At this point air was drawn through the AgCl for 10 minutes. After the vacuum filtration was finished, the solid AgCl along with the 0.235 g filter paper was transferred to a 47.92 g evaporating dish. Next, this dish was place on a hot plate set at 100 degrees Celsius. At five-minute intervals, the dish was weighed to calculate the mass of dish and its contents. This step was repeated till the difference between two successive measurements was less than 0.005 g. The final dry weight of the AgCl was 0.57 g. To prepare for Beer’s Law plot for Cu2+, 10 mL of a 0.08 M stock solution using 0.136 g of CuCl2 x 2H2O was prepared. The 0.136 g of CuCl2 x 2H2O was then added to a 10mL volumetric flask. At this point, 0.5 M acetic acid was added to the 10mL volumetric flask containing 0.136 g of CuCl2 x 2H2O until it hit the 10mL mark on the flask. The next task was to obtain a set of solutions ranging from 0.010 M to 0.080 M by diluting the stock solution using a 5mL volumetric pipet, 10 mL volumetric flask, and acetic acid. Starting with the stock solution, 5 mL of the solution was drawn out by way of the volumetric pipet and placed in the 10 mL volumetric flask. Then acetic acid was added to the solution until it reached the 10 mL mark on the volumetric flask. This task was repeated until four solutions of 0.080 M, 0.040 M, 0.020 M, and 0.010 M were obtained. The absorbance was measured for each solution at