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For our reaction, the last reagent to be added to the reaction mixture is the Permanganate; step 6 of the procedure below. The timing of the reaction starts "when half of the Permanganate solution has been added to the test tube." This choice is arbitrary and could be problematic. Under what circumstances could it be problematic?

For our reaction, the last reagent to be added to the reaction mixture is the Permanganate; step 6 of the procedure below. The timing of the reaction starts "when half of the Permanganate solution has been added to the test tube." This choice is arbitrary and could be problematic. Under what circumstances could it be problematic?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter12: Chemical Equilibrium
Section: Chapter Questions
Problem 113QRT
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For our reaction, the last reagent to be added to the reaction mixture is the Permanganate; step 6 of the procedure below. The timing of the reaction starts "when half of the Permanganate solution has been added to the test tube." This choice is arbitrary and could be problematic. Under what circumstances could it be problematic?
Using pipets, add the Oxalic Acid solution and the Water to the test tube as specified for Experiment #1 above. (Use a different pipet for each solution!) Turn on the stir plate and allow the contents of the test tube to mix thoroughly. When adding the solutions to the test tube, make sure the tip of the pipette is very close to the bottom of the tube. Otherwise, some of the solution will stick to the sides of the tube and will not be a part of the reaction mixture. Be sure to use good pipetting techniques as using poor techniques will seriously degrade the quality of your data. 5. Pipet the Permanganate solution into the test tube. Start the stopwatch when half of the Permanganate solution has been added to the test tube. This must be done in one quick addition. Again, you must be careful to use good pipetting techniques. This is particularly important for the Permanganate solution. A single misplaced drop can seriously affect the quality of the kinetic data. 6.
Transcribed Image Text:Using pipets, add the Oxalic Acid solution and the Water to the test tube as specified for Experiment #1 above. (Use a different pipet for each solution!) Turn on the stir plate and allow the contents of the test tube to mix thoroughly. When adding the solutions to the test tube, make sure the tip of the pipette is very close to the bottom of the tube. Otherwise, some of the solution will stick to the sides of the tube and will not be a part of the reaction mixture. Be sure to use good pipetting techniques as using poor techniques will seriously degrade the quality of your data. 5. Pipet the Permanganate solution into the test tube. Start the stopwatch when half of the Permanganate solution has been added to the test tube. This must be done in one quick addition. Again, you must be careful to use good pipetting techniques. This is particularly important for the Permanganate solution. A single misplaced drop can seriously affect the quality of the kinetic data. 6.
Stock solutions of each of the reagents are provided at the following concentrations: 0.755 M [H¿C¿O4] [MnO,] 0.130 M We will vary the initial concentration of the Oxalic Acid and Permanganate by varying the volume of each reagent added to the reaction mixture. The concentration (volume) of only one species will be varied from one experiment to the next so as to determine the influence of only the species being varied. Because the endpoint of the reaction is difficult to determine, each experiment will be performed in triplicate and the results will be averaged. Each experiment will be prepared as follows: Experiment Oxalic Acid Permanganate Water Trial 1 Trie 2 Trial.3 5.00 1.00 6.00 10.00 1.00 1.00 5.00 2.00 5.00 1. Label a clean 100mL beaker: "Oxalic Acid" Obtain ~75 mL of Oxalic Acid solution and place it in the beaker. Oxalic Acid is poisonous. Wear gloves when handling solutions containing Oxalic Acid. If some spills on your skin, rinse it off with copious amounts of water. Large spills require flushing with water for 15 minutes. 2. Do the same for a beaker for Water. 3. Label a clean 50 mL beaker: "Permanganate Ion" Obtain ~25mL of Permanganate and place it in the beaker. Permanganate is a strong oxidizing agent. Handle solutions of Permanganate with gloves. 4. Obtain a large test tube and clamp it in place over a stir plate. Add a small stir bar to the test tube.
Transcribed Image Text:Stock solutions of each of the reagents are provided at the following concentrations: 0.755 M [H¿C¿O4] [MnO,] 0.130 M We will vary the initial concentration of the Oxalic Acid and Permanganate by varying the volume of each reagent added to the reaction mixture. The concentration (volume) of only one species will be varied from one experiment to the next so as to determine the influence of only the species being varied. Because the endpoint of the reaction is difficult to determine, each experiment will be performed in triplicate and the results will be averaged. Each experiment will be prepared as follows: Experiment Oxalic Acid Permanganate Water Trial 1 Trie 2 Trial.3 5.00 1.00 6.00 10.00 1.00 1.00 5.00 2.00 5.00 1. Label a clean 100mL beaker: "Oxalic Acid" Obtain ~75 mL of Oxalic Acid solution and place it in the beaker. Oxalic Acid is poisonous. Wear gloves when handling solutions containing Oxalic Acid. If some spills on your skin, rinse it off with copious amounts of water. Large spills require flushing with water for 15 minutes. 2. Do the same for a beaker for Water. 3. Label a clean 50 mL beaker: "Permanganate Ion" Obtain ~25mL of Permanganate and place it in the beaker. Permanganate is a strong oxidizing agent. Handle solutions of Permanganate with gloves. 4. Obtain a large test tube and clamp it in place over a stir plate. Add a small stir bar to the test tube.
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