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Experiment 6. Molar Mass of a Volatile Liquid

Experiment 6. Molar Mass of a Volatile Liquid. Experimental Procedure Lab 406. A. Preparing the Sample. Prepare a boiling water bath on a for PARTA.3

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Experiment 6. Molar Mass of a Volatile Liquid

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  1. Experiment 6. Molar Mass of a Volatile Liquid Experimental Procedure Lab 406

  2. A. Preparing the Sample

  3. Prepare a boiling water bath on a for PARTA.3 Prepare the flask for sample. Record the number of your unknown liquid. Place a small square of aluminum foil over the mouth of a clean, dry-125 mL Erlenmeyer flask. Fold the foil loosely around the neck and secure a rubber band. Make a very small hole in the center of the foil with a pin. Weigh the flask, foil cap, and rubber band. 2. Prepare a boiling water bath. Place about 350 mL of water and some boiling chips in a 500 mL beaker and begin heating it to bring the water to a boil.

  4. 3. Place the sample in the flask. While the water is heating, remove the foil from the Erlenmeyer flask and place about 2 mL of your unknown liquid in the flask; then replace the foil and rubber band. Clamp the flask at the top of the neck.

  5. B. Vaporize the Sample

  6. 1. Place the flask/sample in the bath. After the water has been brought to a boil, record its temperature and barometric pressure. Insert the Erlenmeyer flask as far as possible into the boiling water, holding it by hand using the clamp. After about 4 minutes remove the flask from the boiling water and examine it to see if all of the unknown liquid has vaporized (including any that condensed in the neck). If it has not, reinsert the flask into the boiling water for a few minutes. Caution not to heat the volatile liquid for too long ! After all the liquid has vaporized, remove the flask by means of the clamp and set it aside to cool.

  7. ## The movable arm hood is a local exhaust system that can be ventilated small contaminated air to protect both user and area safety from harmful material. Please, place the hood close to source of unknown liquid vapor during the heating.

  8. 2. Measure the mass of the flask/sample. After the flask has cooled to room temperature, wipe it dry and remove any water that may adhere to the aluminum. Weigh the flask, cap, rubber band, and condensed unknown liquid. Calculate the mass of the condensed liquid. Calculate the mass of the condensed liquid. Remove the cap and fill the flask completely with water. Measure the volume by pouring the water into a large graduated cylinder. Calculate the molar mass of the unknown using the Equation.

  9. Unknown Liquids Methanol Absolute Ethanol Acetone 2-propanol n-hexane Cyclohexane 1-pentaene Cis-2-pentene 2-butanone N-pentane Cyclohexene 1-hexene Ethyl acetate

  10. DISPOSAL: Dispose of the leftover unknown liquid in the Waste Organics container in the chemical hood.

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