2311 quiz 2 2009 - Chemistry 2311, Spring 2009 Student Name...

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Chemistry 2311, Spring 2009 Student Name ______________________________ Last Name of TA _______________ Quiz #1B (50 pts) 1. Safety, Waste handling, and Standard Lab Techniques In succinct words explain … 12 pts a. when a vacuum filtration is preferred over a gravity filtration When the solid being collected is or contains the desired product b. why a hotplate should be used in the hood when concentrating low boiling organic solvent such as diethyl ether low boiling solvents can ignite from either the heat of the hot plate or electrical sparks from them. c. why boiling stones should never be added to a hot reaction reaction mixture the solution will be superheated and will most likely bump or react violently when the boiling stones are added. d. how an excess aqueous HCl solution should be handled as waste neutralized with base (NaHCO 3 ) and flushed down the drain. e. how a used column chromatography column should be handled as waste solvent should be removed from the column by passing air through it and then the silica gel should go in the nonhazardous solid waste and solvent in the ORGANIC SOLVENT HAZARDOUS WASTE
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This note was uploaded on 02/20/2010 for the course CHEM 2311 taught by Professor Wissinger during the Spring '10 term at University of Minnesota Duluth.

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2311 quiz 2 2009 - Chemistry 2311, Spring 2009 Student Name...

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