CHEM
Lab 2-1

# The literature values of the orders with respect to

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The literature values of the orders with respect to CV+ are and OH are 1 and 1 respectively. How do your values compare? (2 pts) Rate=(2.344e22 mol^-1 sec^-1)*[CV+][OH-] My values for the order of CV+ and OH- are somewhat close to the literature values: source of error: CV+ = (1.0-1.0)/1 = 0% OH- = (1.0-1.0)/1 = 0% 2. Discuss your largest source of error in Part II. (2 pts) My largest source of error in part II was most likely in mixing and measuring the reagents. It is difficult to make the perfect solutions, and they could have alos been porrly mixed before being placed in the machine. The timing also could have been inaccurate for some of this as well. Reaction Order Determination for OH - HINT BOX: Before you proceed, make sure you understand what you are doing here. Please refer to the "Intro" document in the Prelab section of the Experiment 2 website for a detailed explanation of the approach we are taking for this part of the lab. You will first evaluate the data for the CV+ standards to obtain a value for Molar Absorptivity that you will then use to convert Absorbance data to [CV+] (Remember: A= ε bc) When working with linear relationships, i.e. straight line plots, one can utilize the "slope" and "intercept" functions in Excel. These are a part of a linear regression function, and calculate the slope of the "best fit line" for a given set of data and the point at which the best fit line for the data will cross the y-axis (y-intercept). To use these functions, click on the cell in which you want the result to appear, B337 for the slope and B338 for the y-intercept, and enter the following: =slope(H305:H308,G305:G308) =intercept(H305:H308,G305:G308) H305:H308 represent the cells that contain your y-data, and G305:C:308 represent your x-data. This is a short cut to creating an actual plot of the data and generating the trendline equation of y = mx + b. You will create three plots on page 9, using the data from run 1 below, to determine the order of the reaction with respect to CV+. If the plot of [CV+] vs t is the most linear, the order will be 0. If plotting ln[CV+] vs t is the most linear, then the reaction is first order with respect to CV+. The third plot that you will make is 1/[CV+] vs t. If this last plot is the most linear of the three plots, then the reaction is second order with respect to CV+. Once you know the order of the reaction in terms of CV+, you will perform the necessary "slope" functions for the other three runs to determine k' for each run. Be sure to replace the "?" in the label at the top of the data column so that it's clear which calculation you are performing. When you get to the section for determining the order of the reaction with respect to OH-, you will also need to use the "intercept" function mentioned above. Experiment 2: Chemical Kinetics Part I: A Clock Reaction Part II: Crystal Violet-Hydroxide Reaction Note: All sections of this report must be typed.
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