Using the air in a flask, measure the change in volume with temperature.
2-Hole Rubber stopper
250 mL Erlenmeyer flask
100 mL Graduated cylinder
10 mL Syringe
Syringe dispensing tip
- Connect the syringe dispensing tip to the end of the syringe.
- Set up your experiment by unscrewing the cap off the 250 mL Erlenmeyer flask. Then, press the 2-hole rubber stopper into the 250 mL Erlenmeyer flask. Push the thermometer into one of the holes in the stopper, and the syringe dispensing tip (connected to the syringe) in the remaining hole.
- Create an ice water bath by filling an empty container (large enough to fit the 250 mL Erlenmeyer in it) with water and ice. The exact volume does not matter as long as it is high enough to cover the flask.
- Place the flask in the bath. Allow the flask to cool to 0 °C (32 °F). You may need to pour additional ice around the flask to sufficiently decrease the temperature.
- Monitor the temperature until the air reading in the flask is 0 °C.
- Remove the flask from the ice bath and discard the ice/water from the bath container.
- Allow the flask to warm to room temperature. As the flask warms up, record the volume on the syringe and the temperature on the thermometer in Table 4. The volume and temperature at room temperature are the initial (Time = 0) data.
Note: The gas in the flask expands as it warms, slowly pushing the piston out of the syringe. The total volume of the gas in the system is equal to the volume of the flask plus the volume of the syringe.
- Use the graduated cylinder to measure and add 100 mL of hot (but not boiling) water to the water bath container and place the flask in the warm water.
- Continue to record the volume reading on the syringe and the temperature on the thermometer as the gas in the flask heats every five minutes for 30 minutes. Record your results in Table 4.
- Graph your results as temperature vs. total volume. Draw a best-fit straight line through your data points and determine the formula for the line in Y = mx +b form. Don’t forget to title your graph and label your axes. You may also use a graphing software program for more accurate data plots.
- According to your graph, what would the total volume be at a temperature of 70 °C? 30 °C?
- How do your results demonstrate Charles’ Law? Use mathematical expressions to explain your answer.