Postlab 2 - Name and ID: Jeff Johnson 0720855 Lab Partner:...

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Unformatted text preview: Name and ID: Jeff Johnson 0720855 Lab Partner: Kevin Hung Quiz Section: BJ Grading: 60 pts. Experiment 2: Part I: A Clock Reaction Part II: Crystal Violet-Hydroxide Reaction By signing below, you certify that you have not falsified data and that you have not pla any part of this lab report. Signature: Purpose and Method Part I: Clock Reaction (3 pts) units Part II: Crystal Violet-Hydroxide Reaction (3 pts) Stock Solutions Soln. Conc. Units M 0.010 M 0.040 M HCl 0.100 M Experiment Test Tube #1 Test Tube #2 Temp. Run Celsius Time # ml ml ml ml ml C sec. 1 0.75 0.50 0.25 0.50 0.50 21.9 145 2** 0.50 0.50 0.50 0.50 0.50 21.1 120 3 0.25 0.50 0.75 0.50 0.50 20.5 78 4 0.00 0.50 1.00 0.50 0.50 20.1 55 5 0.75 0.50 0.50 0.25 0.50 20.6 240 6** 0.50 0.50 0.50 0.50 0.50 22 62 7 0.25 0.50 0.50 0.75 0.50 22.3 50 8 0.00 0.50 0.50 1.00 0.50 21.6 37 9 0.75 0.50 0.50 0.50 0.25 22.8 278 10** 0.50 0.50 0.50 0.50 0.50 22 70 11 0.25 0.50 0.50 0.50 0.75 21.2 60 12 0.00 0.50 0.50 0.50 1.00 24.3 12.54 13 0.50 0.50 0.50 0.50 0.50 127 14* 0.75 0.50 0.50 0.50 0.25 25.4 36.7 15* 0.75 0.50 0.50 0.50 0.25 150 * Measurements made with a drop of 1.0 mM Ammonium Molybdate ** Repeated measurements for calculating k and Ea A drop of 1% Starch indicator solution is included in each run. S 2 O 3 2- I- BrO 3- H 2 O S 2 O 3 2- I- BrO 3- H + Reaction Order Determination for I- Data, Calculations and Graphs Please provide a sample rate calculation here (handwritten is fine): (2 pts) rate = 1/6 [S 2 O 3 2- ] / delta t = 1/6 * .0001 M / 145 s = 1.15e-7 M/s Experiment Temp Initial Concentrations (M) Time Rate Run # Celsius sec M/sec Run 1 21.9 1.0E-04 1.0E-03 2.0E-02 8.0E-03 145 1.1E-07 Run 2 21.1 1.0E-04 2.0E-03 2.0E-02 8.0E-03 120 1.4E-07 Run 3 20.5 1.0E-04 3.0E-03 2.0E-02 8.0E-03 78 2.1E-07 Run 4 20.1 1.0E-04 4.0E-03 2.0E-02 8.0E-03 55 3.0E-07 X-axis Y-axis log(Rate)-3.00-6.94-2.70-6.86-2.52-6.67-2.40-6.52 Experiment Temp Initial Concentrations (M) Time Rate S 2 O 3 2- I- H + BrO 3- log(I- ) Reaction Order Determination for BrO 3- Provide an example concentration calculation (handwritten is acceptable): [S 2 O 3 2- ] = M 1 V 1 / V 2 = (.0005M*.50ml) / 2.5ml = .0001 M HINT BOX Recall that since BrO3- and H+ where held constant, the rate law takes on the following form (see pg. 29 in the lab manual): Rate = B[I- ] i Therefore, a plot of log(Rate) vs. log(I- ) will yield a straight line with a slope equal to i, the order of the reaction with respect to I- . Place your plot relating to the reaction order for I- here. Refer to the box above for hints. Properly label your graph (labels for axes, including units, and a title). Include a trendline and its equation and R 2 value on your graph. This is done by right-clicking on one of the data points on your graph and choosing "Add Trendline" from the drop down menu. The first tab asks what type of trendline you wish to use, and the Options tab allows you to include the trendline equation and R 2 value....
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This note was uploaded on 05/08/2008 for the course CHEM 162 taught by Professor N. during the Spring '08 term at University of Washington.

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Postlab 2 - Name and ID: Jeff Johnson 0720855 Lab Partner:...

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