Reaction Order and Rate Essay

648 WordsSep 13, 20153 Pages
Reaction Order and Rate Laws Peter Jeschofnig, Ph.D. Version 42-0195-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Observations & Questions A. Calculate the initial and final concentrations as needed to complete Tables 1 and 2. B. Calculate the average reaction time for each reaction by adding the times for the two trials and dividing by 2. Data Table 1: Varying the Concentration of 1.0 M HCL ---- C o n c e n t r a t i o n s ---- # drops # drops # drops Initial Initial Final Final Reaction Time (sec) Reaction Well # HCl Water Na2S2O3 HCl Na2S2O3 HCl Na2S2O3 Trial 1 Trial 2 Average Rate (sec-1) 1 12 0 8 1M 0.3M 0.5M 0.3M 48 46 47 0.021 2 6 6 8 0.5M 0.3M 0.3M 0.3M 57 56 56.5 0.018 3 4 8 8 0.33M 0.3M 0.20M 0.3M 65 61 63 0.016 Data Table 2: Varying the Concentration of 0.3 M Na2S2O3 ---- C o n c e n t r a t i o n s --- # drops # drops # drops Initial Initial Final Final Reaction Time (sec) Reaction Well # HCl water Na2S2O3 HCl Na2S2O3 HCl Na2S2O3 Trial 1 Trial 2 Average Rate (sec-1) 1 8 0 12 1M 0.3M 1M 0.18M 32 31 31.5 0.032 2 8 6 6 1M 0.15 1M 0.09M 81 80 80.5 0.012 3 8 8 4 1M 0.1 1M 0.06M 135 136 135.5 0.0074 C. Calculate the reaction rate by taking the inverse of the average reaction time, i.e., 1 divided by

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