Monday, April 7, 2008 - 4B

Handed back and went over any questions on Chapter 2 test. Recollected tests.

Students did Fractional Distillation Lab Day 1.
1. Put 3-5 boiling chips in the large test tube
2. I will then give you ~ 25 mL of mixture in the large test tube
3. Take data every 30 seconds
4. Stop when you have 1 - 1.5 cm of liquid in the original test tube.
5. Clean a petri dish and put a small amount of the remaining green mixture in the petri dish. Put it in the box and let it evaporate and crystallize.
6. Pour the rest of the green liquid (including boiling chips), and all the liquid you distilled into the designated beaker. Nothing goes down the sink.
7. Plot graph. Everyone plots the data on graph paper
8a. On graph, clearly indicate the plateaus and boiling points and show the BP temperatures
8b. For each section of the graph, clearly show where you have alcohol, water, or a mixture.
8c. Show swap temperatures on the graph.

For Homework, plot graph, make sure you have a sketch of the lab setup, material list, and procedure notes in you notebook. Include the special safety precautions such as: be sure to carefully regulate the boiling so you don't over boil and be sure to raise the rubber tubing out of the collected liquid before you shut off your alcohol burner.

Don't put so much ice water in the Erlenmeyer flask that it goes into the collection test tube.

Next class we will do the actual separation in Day 2 - Fractional Distillation.