A Microscale Approach to Organic Laboratory Techniques (5th by Donald L. Pavia, Gary M. Lampman, George S. Kriz, Randall G.

By Donald L. Pavia, Gary M. Lampman, George S. Kriz, Randall G. Engel

From biofuels, eco-friendly chemistry, and nanotechnology, this confirmed laboratory textbook offers the up to date insurance scholars desire of their coursework and destiny careers. The book's experiments, all designed to make use of microscale glassware and kit, disguise conventional natural reactions and syntheses, the isolation of ordinary items, and molecular modeling and comprise project-based experiments and experiments that experience a organic or health and wellbeing technological know-how concentration. up-to-date all through with new and revised experiments, new and revised essays, and revised and increased innovations, the 5th version is geared up in line with essays and issues of present curiosity.

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Extra info for A Microscale Approach to Organic Laboratory Techniques (5th Edition)

Example text

When accurate ­quantities of liquid reagents are required, the best technique is to deliver the ­desired amount of liquid reagent from the pipette into a container whose tare weight has been determined previously. The container, with sample, is then weighed a second time in order to obtain a precise value of the amount of reagent. Automatic pipettes may vary in design, according to the manufacturer. The following description, however, should apply to most models. The automatic pipette consists of a handle that contains a spring-loaded plunger and a micrometer dial.

4 ­Setting the temperature of the hot plate too high will result in too much loss of solvent through evaporation. C A U TION In performing the following procedure, keep in mind that the mixture in the Craig tube may erupt out of the tube if it becomes superheated. You can prevent this by stirring the mixture constantly with the spatula and by avoiding overheating the mixture. Dissolving the Sulfanilamide Before heating the Craig tube containing the sulfanilamide, add enough hot solvent with a Pasteur pipette to barely cover the crystals.

6 Your goal will be to find a good solvent for crystallizing the sample. You should try water, methyl alcohol, and toluene. After you have determined which is the best solvent, crystallize the remaining material. Finally, determine the melting point of the purified compound and of the impure sample. 6 with three separate samples of impure fluorene. Use the following solvents: methyl alcohol, water, and toluene. 5 An alternative method for inducing crystallization is to dip a microspatula into the solution.

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