Assignment:
Charles' Law Lab
Purpose: To study the effect of temperature changes on the volume of a gas.
Introduction: When a gas is heated at a constant pressure, it will expand. When cooled at a constant pressure, the gas will contract. Quantitatively, these observations are summarized in Charles' Law. When the pressure and mass of a gas are kept constant, the volume of the gas will vary directly with its absolute temperature.
To calculate the absolute temperature of a gas, add 273 K to its Celsius temperature. The volume of a gas is measured in milliliters (mL) or liters (L).
Charles' Equation
V2 = V1 X T2/ T1
In this experiment we will test the validity of Charles' Law. A quantity of air at about 100°C will be cooled to room temperature. The experimentally determined volume change will be compared with the change predicted by the equation.
Equipment: ring stand, thermometer, Bunsen clamp, 125mL Florence flask, two 1000 mL beakers, 100mL graduated cylinder. one hole stopper with glass tubing, and hot plate.
Procedure:
1. Arrange the apparatus as shown in figure A below. Immerse the dry round bottom flask up to the neck in the boiling water.
2. Wait ten minutes, and record the temperature of the boiling water. Record the temperature of the boiling water as the 'that temperature of the air on the data table.
3. While waiting ten minutes fill the second 1000 mL beaker %of the way with water.
4. With the flask still submerged in the boiling water press your finger over the glass tubing and remove the flask from the boiling water. Do not remove your finger from the opening!
5. With your finger over the opening invert the flask into the room temperature water, release your finger and observe what happens. Be sure the flask is completely submerged.
6. Record the temperature of the water in the second beaker when it remains constant.
7. Raise the flask so the water level inside the flask coincides with the water level outside the flask.
8. Place your finger over the opening and remove the flask from the water.
9. Using a 100 mL graduated cylinder record the amount of water that entered the flask.
10. Record this volume on the data table.
11. Fill the flask with water to the stopper mark and measure the volume of the entire flask.
12. Record this volume on the data table.
13. Repeat the procedure a second time and record data under trial 2.
Provide complete and step by step solution for the question and show calculations and use formulas.