CHE102 flowchart exp. 13

CHE102 flowchart exp. 13 - -Weigh about 0.40g of unknown...

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CHE 102 Julianne Stiene Exp. 13 Flow Chart February 4, 2008 - Weigh a clean and dry 25 x 200 mm test tube to the nearest 0.002g. - Transfer about 4.0 g of lauric acid to the test tube and reweigh. - Record mass. - Clamp the test tube on a ring stand so that the bottom of the test tube is in a 400 mL beaker containing approximately 200mL of water supported on a wire gauze - Adjust test tube so it is about 1 inch above bottom of beaker - Carefully insert a thermometer into the test tube - Heat water with a Bunsen burner to about 50 degrees C - Raise test tube out of the water and remove the water bath - Take temperature readings every 30 seconds for 15 minutes - Carefully stir the solution with thermometer at a constant rate as solution cools - Temperature will decrease at first but will remain steady as sample freezes - After completely solidified, temperature will start to drop again - Continue to take temperatures until stirring is impossible - Record temp-time data in table 13.2
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Unformatted text preview: -Weigh about 0.40g of unknown acid to the nearest 0.001g and carefully add to test tube-Record mass date in table 13.3-Tap test tube with finger so all unknown acid is down in the lauric acid-Insert test tube back into water bath and reheat water to 50 degrees C so lauric acid will melt-Raise test tube out of water and remove water bath-Take temperature readings every 30 seconds for 15 minutes-Stir sample with thermometer at a constant rate as the solution cools until stirring becomes impossible-Record temp-time data in table 13.4-Plot readings for temperature versus time to determine the freezing point of solution. CHE 102 Julianne Stiene Exp. 13 Flow Chart February 4, 2008-When completed, warm test tube gently in water bath until lauric acid melts-Remove thermometer and wipe-Pour molten lauric acid solution into jar marked USED LAUREN ACID-Perform calculations on back of table 13.5...
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CHE102 flowchart exp. 13 - -Weigh about 0.40g of unknown...

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