Tuesday, Feb 19, 2008 - 4A

Collected any Safety Contracts not already handed in. The Safety Contracts are needed before students can do any chemistry labs in Physical Science.

Equipment Quiz
Safety Quiz

Introduction to Distillation of Wood Lab
This is a two day lab. On the second day students will actually do the distillation. Distillation means separating substances based on differences in their boiling points.

This lab requires a formal lab write-up (to be discussed later)

Sketched and discussed set-up for Day 1 of Distillation of Wood
Safety precautions:
1. Clamp burning test tube near open end to prevent melting rubber stopper
2. Glass L entering collection test tube should be below the level of the ice water in the Erlenmeyer flask
3. VERY IMPORTANT: Remove rubber tubing from water-filled bucket BEFORE shutting off alcohol lamp, otherwise cold water will back flow into collection test tube and then into burning test tube, possibly shattering the hot burning test tube. Do NOT point the rubber tubing at the burner flame.
4. Remove rubber tubing from bucket, shut off alcohol burner, place rubber band at level of gas in Mason jar, then lift the Mason jar completely out of the water before flipping it over so I can toss in a match. If you flip the jar over before it leaves the water you will flood the jar with water and lose the gas.

Students practiced setting up Distillation of Wood Day 1, including setting up rubber stoppers and glass L's. After I checked the set-up, they disassembled it and put away equipment.

Next class, students can immediately start on the lab.

Homework: BRING SAFETY CONTRACT IF YOU HAVE NOT ALREADY DONE SO!!!
Write up procedure for lab.