Experimental Procedure Summary 3 - E xperimental P rocedure...

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Experimental Procedure Summary Name: Niraj Patel ID# 20387356 TA: Chris Goudy Date: November 6, 2010 Experiment #3: The Dumas method for determining the molar mass of a volatile liquid Procedure: Boil water bath using hot plate and 400mL of deionized water in the 600mL beaker Add 1-2 boiling chips Wait for pre-lab talk Form 6 sets of equipment each with 125mL Erlenmeyer flask, one elastic band, and one square of aluminum foil. Label each set, 1-6. Use analytical balances, weight each set and record mass Place 4mL of methanol into a 125mL Erlenmeyer flask and cover with foil and secure with elastic band With a pin, poke two small holes into the foil to allow excess vapour to escape during heating Clamp the flask assembly into water bath with as much of the flask immersed in the water at a 45 degree angle (to see if liquid evaporates) Keep water bath to a slow boil Make sure no water gets inside the flask (OR ELSE START OVER)
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Unformatted text preview: • Once all liquid disappears, continue heating for 1 min • Record exact temp of water to the nearest 0.1 degrees Celsius and remove flask from bath • Dry the outside of the flask and let it cool to room temperature so vapour condenses • Weight flask assembly 15+/-5 minutes after removing from bath • Empty condensed liquid into waste bucket and fill empty flask to the brim with water • Measure volume of water in each flask accurately with graduated cylinder • Do 3 trials using new set of equipment and record whole assembly again • Repeat all steps using unknown instead of methanol • Remember to record # of unknown (3 trials required) • Record barometric pressure given by lab instructor • Clean the 3 flasks with soap and rinse with tap water then deionized water • Return to store room as dry as possible...
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  • Spring '10
  • Bissonnette
  • Chemistry, Erlenmeyer f lask, Chris Goudy, lask assembly

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