b. Remove the plastic Beral pipet from the water bath and quickly transfer the 1 mL of KI solution into the test tube. Tap or lightly shake the test tube to mix the reagents. c. Seal the test tube with the one-hole stopper connected to the Gas Pressure Sensor. d. Place the test tube back in the water bath. 7. Start data collection. Data will be collected for five minutes. If necessary, gently hold the test tube so that it stays completely immersed in the water bath.
Advanced Chemistry with Vernier 12 - 3 The Decomposition of Hydrogen Peroxide 8. When the data collection is complete, carefully remove the stopper from the test tube to relieve the pressure. Dispose of the contents of the test tube as directed. 9. Determine the initial rate of the reaction. a. Identify a linear region just beyond the initial flat portion of the graph b. Tap the data point at the beginning of the linear region. Drag your stylus across the graph to select about one minute of data. c. Choose Curve Fit from the Analyze menu. d. Select Linear as the Fit Equation. e. Record the slope, in your data table, as the initial rate for the reaction and select OK. 10. Store the data from the first run by tapping the File Cabinet icon. 11. Rinse and clean the test tube for Part II. Part II Decompose 3% H 2 O 2 solution with 0.25 M KI solution at ~20°C 12. Measure out 4 mL of 3% H 2 O 2 solution into the test tube. Seal the test tube with the solid rubber stopper and place the test tube in the water bath. 13. Add 1 mL of distilled water to the remaining 1 mL of KI solution in the graduated cylinder. Swirl the mixture gently to mix the solution. 14. Draw 1 mL of the KI solution into a plastic Beral pipet. Invert the pipet and immerse the reservoir end of the pipet in the water bath. Allow both the test tube and the Beral pipet to remain in the water bath for at least two minutes before proceeding. 15. Repeat Steps 6–11 to conduct Part II. Remember to save the data.
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- Summer '09