Lab #7 - The Molar Volume of Dioxygen Sylwester Czado...

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The Molar Volume of Dioxygen Sylwester Czado Chemistry 191 Lab Report, Experiment #11 Lab Partners: Ellen Richer, Michael Folcarelli, and Bukola Bakare Instructor: Brian Corbett 10-20-05
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Introduction The purpose of doing this particular experiment was to determine the molar volume of a gas. I will gain experience in making quantitative measurements of gas volumes. We are doing this particular experiment to use Dalton’s law of partial pressures and the ideal gas law. I will also calculate the volume of a gas at the standard temperature and pressure. That is why we are using this particular method as opposed to the alternatives. Procedure Special Supplies: 250-mL Erlenmeyer flask with a No.5 one-hole rubber stopper; 500- mL Erlenmeyer flask with a No.5 two-hole rubber stopper; 6-8-cm lengths of 6-mm-OD glass tubing; 30 cm length of 6-mm-OD glass tubing with a 90° bend 8 cm from one end; 10 x 75 mm test tube; 600-mL beaker; 3/16-in.-ID rubber tubing; pinch clamp; thermometer; 500-mL graduated cylinder; barometer; analytical balance with a 150-g capacity; and a pipet bulb. Chemicals: 3% (approximately 0.9 M) hydrogen peroxide; active dry yeast; Assemble the apparatus and lubricate each piece of glass tubing with a drop of glycerol. Wrap it in a towel while inserting in the rubber stopper. Now the 250-mL Erlenmeyer flask-flask A- will be empty. The solution and test tube will be added later. Slide an empty 10 x 75 mm test tube into the flask. Let the test tube stand at an angle inside the flask without it tipping over and lying flat. Do this before putting any solution in the 250-mL flask. Then remove the test tube from the empty flask. Measure 8.0 mL of 3% H 2 O 2 solution in a graduated cylinder and pour it into the 250-mL flask
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(flask A). Put 50-100 grains (0.050 g) of active dry yeast into a clean, dry 10 x 75 mm test tube. Hold the flask at a 45° angle and slide the test tube into the flask. You could also lower the test tube with a pair of forceps. Then place the one-hole stopper in the flask and seat the stopper firmly. The short length of glass should already be inserted in it. Do not allow any solution to run into the test tube. The yeast cannot touch hydrogen peroxide. If
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Lab #7 - The Molar Volume of Dioxygen Sylwester Czado...

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