General_Information

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School

University of Minnesota-Twin Cities *

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3283

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Chemistry

Date

Nov 24, 2024

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pdf

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1 GENERAL INFORMATION Safety Goggles: Students are required to provide an approved pair of safety goggles in order to be admitted to the laboratory. Approved safety goggles are available at the campus bookstore. The recommended goggles for organic chemistry are marked as such. These goggles meet specifications of the U.S. Occupational Safety and Health Act (OSHA-ANSI287.1-1979) and are approved by the Chemistry Department Safety Committee. Disposable Gloves: Each student should have a box of disposable gloves. Appropriate gloves are available at the campus bookstore, including non-latex and powder-free. There are many other type and sources of disposable gloves available; any of these are fine as long as you check with your AI that the glove is appropriate for the chemicals that are being used in the experiment. Students can share boxes of gloves as long as the gloves are always available to each student during the appropriate lab period. Laboratory Coat: Each student must wear a laboratory coat for each lab. A disposable lab coat is available in the campus bookstore. Laboratory Time: Students are expected to complete each experiment and clean up their bench within the allotted laboratory time. It is extremely important that students arrive at the start of the laboratory period and be well prepared to carry out the experiment. Please note that the official clock for the lab can be found as Central Time at https://www.time.gov/ Reports and Products: At the end of each experiment, each student will be asked to complete a report containing pertinent data, and attach other relevant data as requested. The student also will be expected to submit products prepared during the lab. Labeling of Vials Containing Preparations: To facilitate record keeping as well as handling and disposal in compliance with environmental safety regulations, all preparations must be submitted in completely and accurately labeled containers (vials). Labels for the vials will be provided in each experiment as needed. Vial labels must bear all of the following information (Figure I-1).

2 (1) Compound name (or unknown number) (2) Tare weight (mass of vial with label, but without cap or lid). (3) Physical data (mp or bp) (4) Student's name & Organic chem ID (5) Date Figure I-1. Sample Label for Vials The Importance of Proper Labeling The following article appeared in the St. Louis Post-Dispatch on June 13, 2005 p A4. The detergent barrels should have been re-labeled as ”used hydraulic fluid.” Hospitals’ instruments were contaminated About 3,800 patients at two hospitals run by Duke University Health System were operated on last year with instruments that had been washed in hydraulic fluid instead of detergent, hospital regulators said. Duke Health Raleigh and Durham Regional hospitals put patients in “immediate jeopardy” in November and December by not detecting the problem, according to a report by the Centers for Medicare &Medicaid Services. The mix-up apparently occurred when an elevator company drained hydraulic fluid into empty detergent barrels last summer. The detergent supplier later picked up the barrels and mistakenly redistributed them as washing fluid. Dozens of patients who were exposed to the surgical instruments have reported lingering health concerns, the (Raleigh) News & Observer reported Sunday. Duke Health officials declined to comment, citing possible lawsuits.

3 Standard Taper Glassware: Glassware with ground glass joints is costly and must therefore be handled with considerable care and foresight. Ground glass joints have a tendency to stick together or "freeze". Freezing can be avoided by observing the following precautionary rules: (1) Keep ground glass joints immaculately clean. Scrub joints with soap and water. Wipe away organic material and grease with a paper tissue soaked in acetone. (2) Apply a light coat of acetone-soluble grease to the upper edge of all inner joints before inserting them into outer joints. (3) Gently rotate the inner joint in the outer joint to distribute the grease evenly. (4) Dismantle ground glass assemblies immediately after use. If despite these precautions, two pieces of ground glass equipment freeze together, consult your AI. Notebook: In previous years, paper copy of the lab manual and carbonless lab notebook was used for the lab. However, starting Fall 2020, we will be using the E-lab manual instead of the paper version of the lab manual and the lab notebook. Report Formats: Detailed example of what should be included in the Pre-lab reports and Data and Observation reports can be found in Appendix C . There is also “Tips for Keeping a Good Laboratory ( Notebook ) Report ” included at the end of procedure for each experiment. Utilize these to ensure that you didn’t miss any information that should be included in the reports. Supplemental Texts and Sources: There are three books available in each lab that contain additional information on chemicals or laboratory techniques. The “CRC Handbook” and “Sigma-Aldrich Chemical Catalog” contain physical data on every chemical used in lab. For more on laboratory techniques, consult “Techniques in Organic Chemistry.”

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