Sample Preparation
1. Place the unknown analgesic into a 50 mL beaker.
2. Add 25 mL of GC/MS grade methylene chloride.
2. Stir the mixture for several minutes with a stirring rod.
3. Filter (gravity) the mixture into a 50 mL Erlenmeyer flask.

GC/MS Analysis
1. Open ChemStation
2. Method-Load-AcqMethod HS
3. METHOD-RUN
4. Enter the sample name.
5. RUN METHOD
6. Push PREPRUN button and wait until the steady yellow light.
7. Inject 1 mL of the solution into the back inlet.
8. Push START button
9. Override solvent delay? NO
10. Wait until the run is complete.

Data Analysis
1. Open Data Analysis
2. File-Load Data file
3. Select the file.
4. Right double click the peak for MS
5. Right double click the MS to search the MS library (file name NIST98.L)
6. Identify the unknown analgesic.

Active Ingredients List:
· Tylenol: Acetaminophen
· Aspirin: Acetylsalicylic Acid
· Excedrin: Acetaminophen, Acetylsalicylic Acid, and Caffeine
· Anacin: Acetylsalicylic Acid and Caffeine