DRAFT: This module has unpublished changes.
Equipment
- Data collection system
- Stainless steel temperature sensor
- Absolute pressure sensor with quick release connectors and plastic tubing
- Sensor extention cable
- 1500 mL Beaker
- 50 mL Beaker
- 250 mL Erlenmeyer flask
- 50 mL Graduated cylinder
- Hot plate with magentic stirrer and stirring bar
- Utility clamp
- Ring stand
- 50 mL 100% Ethanol
- 50 mL Acetone
- 2 hole rubber stopper
- 1200 mL water
Procedure
- Fill a 1500 mL beaker 3/4 full with water and place it in a hot plate with a magnetic stirrer.
- Mount the 250 mL Erlenmeyer flask on a ring stand using a utility clamp and immerse the flask in water as much as possible. Do not allow any water to get into the flask.
- Heat the water bath until the temperature is about 80 degrees Celsius.
- Place the barbed connector of the absolute pressure sensor tightly into the rubber stopper and connect it to the pressure port of the sensor with a piece of tubing. Insert the temperature sensor into the other hole in the rubber stopper.
- Connect the absolute pressure sensor to the data collection system.
- Start a new experiment on the data collection system and display pressure on the y axis and time on the x axis of a graph.
- Make sure the rubber stopper fits tightly on the Erlenmeyer flask then remove the stopper.
- Transfer 50 mL of ethanol in the Erlenmeyer flask that is in the water bath.
- Once the ethanol starts to boil after about 2 minutes after being placed in the Erlenmeyer flask, remove the flask from the water and immediately insert the rubber stopper tightly.
- Start recording the data and continue to collect data until the temperature drops to about 30 degrees Celsius. Then stop recording the data.
- Discard the ethanol in the organic waste container.
- Repeat steps 8-10 with a 60 degree Celsius water bath and 50 mL of acetone. Record data until the temperature drops to about 25 degrees Celsius.
DRAFT: This module has unpublished changes.
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