Plan your work before starting a laboratory procedure

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Unformatted text preview: Working with Chemicals and Apparatus Following these recommendations will help make your work easier and equipment use safer. ● Plan your work before starting a laboratory procedure. Be sure you know what to do if you or another laboratory worker has an accident. ● Keep your workspace free of clutter. ● Set up clean, dry apparatus, firmly clamped and away from the edge of the lab bench, paying attention to the proximity of reagent bottles to burners and to other workers and their equipment. Choose sizes that can properly accommodate the operation to be performed, allowing at least 20% free space. ● Except for glass tubing, stirring rods, and graduates, use borosilicate glassware (e.g., Pyrex). Examine your glassware closely for flaws such as cracks and chips. Damaged glassware should be repaired (see your instructor) or discarded in a waste container labeled for broken glass. ● Other equipment also should be free of flaws such as cracks, chips, frayed wire, and obvious defects. Check with your instructor if you have questions. ● A properly placed pan under a reaction vessel or container will act as a secondary containment to confine spilled liquids in the event of glass breakage. ● Use shields when working with reactive mixtures. Place the shields in suitable positions to protect yourself and others. Be sure that the shields are stabilized with weights or fasteners so that they cannot be knocked over. Also wear both eye and face protection when using shields. ● When working with flammable gases or liquids: ■ Do not allow burners or other ignition sources in the vicinity unless your instructor directs otherwise. ■ Use appropriate traps, condensers, or scrubbers to minimize release of material to the environment. ■ If you will be using a hot plate or heating mantle, do not proceed with your laboratory work until you know the autoignition temperatures of the chemicals likely to be released and can ensure that the temperatures of all exposed surfaces...
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This document was uploaded on 02/27/2014 for the course PHYS 1B at UCSD.

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