Kinetics Lab
Texto del Guión Gráfico
- MATERIALSData collection devicecolorimetertemperature probebeakersice or hot water bath0.10 M NaOH solution2.5 × 10^–5 M crystal violet solutionPlastic cuvettesBeral pipettes
- Obtain and wear goggles
- Set up the data collection system. a. Calibrate your spectrophotometer or your colorimeter. We will be collecting data using the 565 nm (Green) setting.b. Connect a temperature probe to your device. c. If using a spectrophotometer, you will need to manually record data every 5 seconds. If using a colorimeter set the program to generate a time graph with 3 seconds between samples for 60 samples.
- This first trial will be performed at room temperature. You have been given a pipette of 0.10 M NaOH (colorless solution) and a pipette containing an equal quantity of 2.5 × 10–5 M crystal violet (purple solution). a. Simultaneously squirt both solutions into a beaker or cup. Use the tip of the temperature probe to stir the mixture. Record the temperature of the mixture.
- b. Rinse the cuvette with the mixture, discard the rinse into the sink, refill the cuvette at least 2/3 full and place it correctly in the colorimeter and start data collection for the first trial. c. Once the trial is finished, discard the reaction mixture into the sink.
- Analyze your data using graphical methods as explained in the introduction. Determine the order of CV+ and value of the rate constant, k. Record the value of the rate constant for this trial before proceeding to the next step.
- Repeat Steps 3-4, using the second set of pipettes that have been sitting in the water bath at your station.
- Record your data in the class data table that your teacher has displayed. For your own lab report, mark your group number with an asterisk *.
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