Methods:

Set-Up:

1. Start a new experiment on the data collection system.
2. Connect a stainless steel temperature sensor and a pressure sensor to the data collection system.
3. Place the barbed connector tightly into the rubber stopper.  Connect the barbed connector to the pressure port of the sensor with a piece of tubing.
4. Wrap the Erlenmeyer flask with 10 to 15 rounds of electric tape.  This is a preventive measure in case the flask cracks.  The tape keeps the glass pieces together.
5. Mount of the 250-mL Erlenmeyer flask in a water bath in a 1500-mL beaker.  The water should cover as much of the flask as possible.
6. Place the temperature sensor in the water bath.

Collect Data

Perform the following steps.  Repeat this part of the procedure three times.

1. Measure between 0.150 g and 0.180 g of the unknown metal to the nearest milligram.  Record the mass of the sample in Table 3.
2. Using a graduated cylinder, measure 20.0mL of 3.0 M HCl solution and transfer it into the 250-mL Erlenmeyer flask.
3. Start data recording.
4. Record the initial pressure in Table 3.
5. Drop the measured piece of unknown metal into the flask and immediately insert the rubber stopper airtight.
6. Continue to monitor the pressure.  Once the hissing in the flask is over and the pressure has leveled off, record the final pressure and temperature readings in Table 3.
7. Stop data recording.
8. Remove the stopper carefully and dispose of the spent acid solution properly.
9. Repeat the experiment for a total of three times. 

Fill the Erlenmeyer flask to the top with water and, over a sink or water container, insert the stopper.  Using the 250-mL graduated cylinder, measure the volume of the water to obtain the volume of the flask and record the value in Table 3.

Equipment:

• Data Collection system
• Absolute pressure sensor with quick-release connectors and plastic tubing
• Stainless steel temperature sensor
• Graduated cylinder, 10-mL or 25-mL
• Graduated cylinder, 250-mL
• Erlenmeyer flask, 250-mL
• Beaker, 1500-mL
• Balance
• Rubber stopper with one hole
• 3 M HCl, 100-mL
• Unknown metal (3 pieces), 0.2 g
• Electrical tape, roll