| Charles' Law Lab |
| Purpose: To investigate the relationship between volume and temperature. |
| Materials: 500 or 600 ml beaker filled with water Ring Stand, Ring and Clamp Bunsen Burner, wire guaze |
| gloves, apron, safety goggles erlemyer flask, one hole stopper (size 5) Size 9 or 10 stoppper to plug up the sink igniter, 100 ml graduated cylinder |
| Procedure: 1. Set up the apparatus so the bunsen burner is under the ring, the large beaker filled with water is on the wire guaze on top of the ring, and the erlemyer flask is clamped onto the ringstand and immersed in water. Put the size 5 one-hole stopper into the erlemyer flask securely. Make sure the set up is unlikely to fall over. Make sure your goggles, apron and gloves are on. 2. Ignite the bunsen burner. Allow the water in the 500 mL beaker to boil for several minutes measure the temperature. Meanwhile, put the size 9 or 10 stopper in the drain to plug up the sink. Fill the sink up to 5-6 cm below the lip of the countertop with cold water and ice. 3. One lab partner should loosen the clamp which secures the erlemyer flask to the ringstand, while another partner prepares to put his/her finger over the hole of the size 5 stopper (located on top of the erlemyer flask). When the first partner says "ready" and lifts the erlemyer flask, the second partner uses his/her gloved hand to seal the hole in the stopper and transfer the sealed flask to the cold water. The first partner lets go, and the second partner flips the lip of the erlemyer flask under the water, bottom side up with the opening no longer sealed by his/her finger,. The second partner holds the clamp, so the erlemyer flask is below the water bottom side up, until all action in the flask is done. Then the water level in and out of the flask are made equal by lifting the flask to the water level. A finger is used to seal the opening, and the flask is flipped right side up (without allowing any water to come into or leave the flask). 4. Pour the water from the flask into the graduated cylinder. Record the volume and temperature of the water. Dump the water. 5. Fill the erlemyer flask to the rim, insert the stopper to allow excess water to overflow. Remove the stopper. Now use the empty graduated cylinder to measure how much water can fit in the erlemyer flask. Remember that if there is more than 100 mL in the flask, it will require that you fill the graduated cylinder to 100ml, dump the water, and add the rest of the water (up to 100 mL) Repeat this process until you know the total volume of the erlemyer flask. (This may be different than the volume listed on the outside of the flask.) |
| Results and Conclusions: 1. Draw a graph with the origin offset to the left of the page. (Temperature ranges from -300�C to +100�C, Volume ranges from 0mL to 300 mL) Is volume vs temperature a linear relationship? Where is the x intercept? 2. The x intercept should have been at -273�C. Calculate your percent error. 3. List any improvements you could make to make this a better/more accurate lab. 4. Explain how this experiment relates to Charles' Law. |
| DATA TABLE Measurement Trial 1 Trial 2 Trial 3 Average Step 5 (100�C) Volume of Water in Flask = Volume of Gas in Flask mL mL mL mL Step 4 (___ �C) Total Volume - additional water in Flask mL mL mL mL Step 4 w/ ice 0 �C Total Volume - additional Water in Flask mL mL mL mL Temperature 1 boiling �C �C �C �C Teperature 2 room temp. �C �C �C �C Temperature 3 ice water �C �C �C �C |
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