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12 Nov 2019
Activation Energy Calculation for Crystal Violet CHM 112 Bonus(5pts) Name: Section: The following data was taken by two chemistry students using a special spectrophotometer set up which could control the temperature and monitor the absorbance at the appropriate wave length. The rate was then measured in triplicate at 25, 35, 45 and 5501C, and the raw data was plotted on a graph of absorbance versus time. The natural logarithm of the absorbance was taken, and this was also plotted against time in order to determine the rate constant. An example spreadsheet with graphs is attached to illustrate this, as well as two pages of the graphs for each temperature run. The three rate constants for each of the temperatures are given in the table below, as given on the two pages of graphs. Your task is to find the average and standard deviation of the triplicate measurements for each temperature, then to determine the activation energy of the reaction of the crystal violet with the sodium hydroxide. 25 EC 3 45 I 55 EC Run / Temp. Run 1 Run 2 Run 3 Mean value -0.00 175 | ã¼0.00368 | -0.00431 | -0.00537 -0.00 160 | -0.00387 | -0.00437 | -0.00727 -0.00 166 | ã¼0.00374 | ä¸0.00438 | -0.00961 Standard dev
Activation Energy Calculation for Crystal Violet CHM 112 Bonus(5pts) Name: Section: The following data was taken by two chemistry students using a special spectrophotometer set up which could control the temperature and monitor the absorbance at the appropriate wave length. The rate was then measured in triplicate at 25, 35, 45 and 5501C, and the raw data was plotted on a graph of absorbance versus time. The natural logarithm of the absorbance was taken, and this was also plotted against time in order to determine the rate constant. An example spreadsheet with graphs is attached to illustrate this, as well as two pages of the graphs for each temperature run. The three rate constants for each of the temperatures are given in the table below, as given on the two pages of graphs. Your task is to find the average and standard deviation of the triplicate measurements for each temperature, then to determine the activation energy of the reaction of the crystal violet with the sodium hydroxide. 25 EC 3 45 I 55 EC Run / Temp. Run 1 Run 2 Run 3 Mean value -0.00 175 | ã¼0.00368 | -0.00431 | -0.00537 -0.00 160 | -0.00387 | -0.00437 | -0.00727 -0.00 166 | ã¼0.00374 | ä¸0.00438 | -0.00961 Standard dev