Wednesday, Feb 27, 2008 - 4A

Went over diagram, set-up, procedure, safety precautions for Day Two of Distillation of Wood Lab.
Important points to consider when writing procedure and safety:
1. Be sure to put 4-5 boiling chips in the burning test tube BEFORE boiling.
2. Place the bottom of the test tube 5-10 cm above the alcohol lamp. You may need to adjust the height depending on your alcohol lamp. Use the wire screen on the iron ring to help regulate the boiling. Do NOT over boil!!
3. There is no rubber stopper in the collection test tube. Keep the tubing above the level of the collected liquid but below the level of the ice water in the Erlenmeyer flask.
4. Stop boiling when you still have 1.5 cm of liquid left in the boiling test tube. Before shutting off the alcohol lamp, make sure the rubber tubing is above the level of the collected liquid. Turn off lamp.
5. Observe any differences between the two liquids. Are they the same or different? How can you tell?
6. Wait ~5 minutes for the burning test tube to cool down then mix the two liquids back together. Do you get back what you started with? How can you tell?
7. Dump liquids into the designated container. Do NOT dump the liquids into the sink!!
8. Rinse equipment and put away.

Talked about write-up for Day 2

Students did Distillation of Wood Day 2 experiment.
Many students did an excellent job and got a clear distillate, especially Viridiana, Alex N, Alysia, Ruby, Kelsey, Sarah, Paige, Tyler, and Alicia.

Students should already have completed and typed up the Day 1 part of the lab following the instructions on the green lab sheet. For homework, students should write-up and type up the procedure, material list, diagram, safety, and observations for Day 2 and start work on the conclusion section. There will be homework next class so students should work on the lab as we go so as not to have a lot to do the night before.

This completes the lab work for the Distillation of Wood Lab. The typed up report is due Thursday March 6. Late papers will not be accepted.

Some students left the class early. These students lost participation points.