Student Worker Training

1. Student Worker Training Austin Peay State University Department of Chemistry Fall 2013

2. Student Worker Responsibilities • Office Help • Mail • Grading • Other miscellaneous responsibilities • Computer Lab Attendant • Monitor room • Note computer problems • Keep printer filled with paper

3. Student Worker Responsibilities • General Laboratory Maintenance • Clean countertops / hoods • Sort / restock lab drawers • Preparing General Chemistry Labs • Prepare solutions and dispensing solids • Collect equipment • Set up / break down labs

4. Arriving to Work… • Sign log book in main office • Report to your assigned supervisor for tasks • If your supervisor is unavailable, check “To Do” list • Ask for something to do There is always something to do!

5. Laboratory Safety • Come to work dressed as you would for lab • Always wear goggles when working • Clean up after yourself • Respect others working with you • Label all solutions properly • Dispose of waste properly • Make sure all doors close behind you

6. General Chemistry Lab Maintenance • Wash down countertops and hoods • Make sure balances and surrounding areas are clean • Fill all deionized water bottles • Fill all detergent and hand soap bottles • Replenish paper towel supplies • Replenish weigh boat supply • Make sure drawers are properly stocked

7. General Prep Room/Stockroom Maintenance • Wash down countertops • Put away clean glassware • Racks • Dishwasher • Wash any dirty glassware • Sweep floor • Last to leave: • Place trash can in Lab A311 • Close door between prep room and A311

8. Other General Maintenance • Cleaning goggles • Wash with soap & water every Friday • Swab with rubbing alcohol during the week as needed • Basic equipment repair and setup • Simple repairs (e.g., fixing broken pipet bulbs) • Equipment setup (e.g., calibrating pH meters)

9. Laboratory Preparation Introductory labs (CHEM 1011, 1021, 1041, 1111, and 1121) are overseen by the lab manager, Mr. Palmer All other labs are overseen by the responsible faculty member

10. Laboratory Preparation • Preparing solutions • Dispensing solids into temporary containers • Gathering equipment • Setting up / removing chemicals and equipment in labs

11. Laboratory Preparation Each introductory lab has an associated prep sheet outlining: • Chemicals • Solutions • Special equipment • Waste disposal

12. Working with Chemicals • Always wear goggles • You may need to wear gloves • Ask your supervisor or check the Material Safety Data Sheet (MSDS) if unsure of specific hazards • Clean up all spills / messes immediately

13. Preparing Solutions • Concentrations needed may be approximate or exact • Use volumetric glassware for exact concentrations • Can use beakers or poly storage bottles for approximate concentration solutions • Some reagents are aqueous solutions and may need to be diluted • Use the dilution equation, McVc = MdVd • Always add concentrated acids to water • All calculations should be checked by your supervisor

14. Using a Balance • NEVER weigh into weigh boat on balance • Place weigh boat on balance • Tare balance • Remove weigh boat from balance and add solid • Place weigh boat back on balance • Remove weigh boat again before adding or removing solid • Dispose of excess solids properly • NEVER put back into reagent bottle, use beaker as temporary waste container • Ask your supervisor if unsure

15. Labeling Chemicals • For introductory labs, labels must match names used in lab • e.g., vinegar vs. acetic acid • Unknowns should match the Prep Sheet • Label format:

16. Labeling Chemical Hazards • NFPA = National Fire Protection Association • Chemicals rated in 4 categories: • Health (blue) • Fire (red) • Reactivity (yellow) • Specific hazards (white) • Each category is rated on a scale of 0 (low risk) to 4 (high risk) • The specific hazard category uses symbols to highlight the special hazard.

17. Label Examples Solution: Solid:

18. Volumetric Glassware Used when exact concentration is necessary Volumetric Flasks Volumetric Pipets Burets

19. Other Glassware Beaker Filter funnel Buchner Funnel Filter Flask Erlenmeyer Flask Graduated Cylinders Crucible & Cover Mortar & Pestle Evaporating Dishes Watch Glass

20. Storage Containers Vials Poly Bottles Amber Bottles Hold 1 – 100 mL Hold 50 – 1000 mL Hold 50 – 1000 mL Glass Bottles Wash Bottles Carboys Hold 50 – 1000 mL Hold 50 – 1000 mL Hold 5 – 30 L

21. Lab Equipment Wire Gauze & Clay Triangle Flints and Strikers Rings Ring Stand Clamp Buret Clamp Bunsen Burner Meeker Burner Tripod

22. Additional Lab Equipment Crucible Tongs and Beaker Tongs Bottle Brushes Thermometers Spatulas and Scoopula Test Tube Holders Cork and Rubber Stoppers

23. Chemical Waste • Always check with your supervisor before throwing anything in the trash • The professor or the lab manager will prepare waste bottles for all chemicals • Check label on waste bottle before adding anything

24. Chemical Waste Label • Waste Label identifies: • Start date • Chemical names • Concentrations • Hazards • Contact info

25. General Waste Disposal Guidelines • DO NOT mix organic solvents (acetone, hexane, etc.) with aqueous solutions • DO NOT pour chemicals down the drain • DO NOT mix halogenated organic solvents (methylene chloride) with non-halogenated organic solvents (hexane) • Chemicals containing heavy metals (metals larger than Calcium, atomic number > 20) MUST be collected

26. General Points • Safety comes first • Clean up after yourself • Respect chemicals and equipment • Be responsible and courteous of those around you • Don’t leave doors propped or unlatched • Clean up after yourself • Don’t be afraid to ask questions • There is ALWAYS something to do