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12 Nov 2019
Rates of chemical reaction II: rate and order of H2O2Decomposition 1. Why were you instructed to keep swirling the Erlenmeyer flask?
A. Order of Reaction Assemble an apparatus for the collection of oxygen similar to that shown in PROCE Figure 30.2. (The rubber tube connections must be smug) Fill the trough with water at room temperature and record the temperature. It may be necessary to add some hot water to achieve room temperature. Add room temperature water to the assembly until the height of water in the buret is about 10 mL from the top when the water in the leveling bulb is at the same level (see Figure 30.2). Check for leaks in the apparatus by lowering the bulb with the system closed. In the absence of leaks, only small changes in the water level in the buret due to pressure changes will occur as the leveling bulb is lowered. Solution 1 Add 10.0 mL of 0.10 M KI and 15.0 mL of distilled water to a clean 125 mL. Erlenmeyer flask. Carefully swirl the flask for a few minutes so that the solution attains the bath temperature in H202 and quickly stopper the flask. One student should keep swirling the flask in the bath as vigorously as possible during the remainder of the experiment; the other student should observe the volume of oxygen produced during the reaction at various times. You should begin recording volume and time after approximately 2 mL of gas have been evolved. Because of the importance of measuring the volume of oxygen evolved at constant pressure, you must meas- ure the volume with the level of water in the leveling bulb that is the same as that in the buret. One student should match the water levels in the buret and the trough. Add 50 mL of 3% Medicine dropper in #0 stopper Leveling bulb Water level in Mohr buret 125 mL Erlenmyer flask Medicine dropper Trough
Rates of chemical reaction II: rate and order of H2O2Decomposition
1. Why were you instructed to keep swirling the Erlenmeyer flask?
A. Order of Reaction Assemble an apparatus for the collection of oxygen similar to that shown in PROCE Figure 30.2. (The rubber tube connections must be smug) Fill the trough with water at room temperature and record the temperature. It may be necessary to add some hot water to achieve room temperature. Add room temperature water to the assembly until the height of water in the buret is about 10 mL from the top when the water in the leveling bulb is at the same level (see Figure 30.2). Check for leaks in the apparatus by lowering the bulb with the system closed. In the absence of leaks, only small changes in the water level in the buret due to pressure changes will occur as the leveling bulb is lowered. Solution 1 Add 10.0 mL of 0.10 M KI and 15.0 mL of distilled water to a clean 125 mL. Erlenmeyer flask. Carefully swirl the flask for a few minutes so that the solution attains the bath temperature in H202 and quickly stopper the flask. One student should keep swirling the flask in the bath as vigorously as possible during the remainder of the experiment; the other student should observe the volume of oxygen produced during the reaction at various times. You should begin recording volume and time after approximately 2 mL of gas have been evolved. Because of the importance of measuring the volume of oxygen evolved at constant pressure, you must meas- ure the volume with the level of water in the leveling bulb that is the same as that in the buret. One student should match the water levels in the buret and the trough. Add 50 mL of 3% Medicine dropper in #0 stopper Leveling bulb Water level in Mohr buret 125 mL Erlenmyer flask Medicine dropper Trough
Beverley SmithLv2
30 May 2019