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Put on a lab coat, splash-proof safety glasses, and nitrile gloves.
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Place labeled containers for halogenated waste and solid reagent waste in a satellite waste hood. Place a glass waste container nearby.
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Label a 20-mL vial as ‘unknown mixture’.
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Measure out 0.5 g of cellulose and add it to the labeled vial. Measure out 4.75 g each of benzoic acid and caffeine and add them to the vial. Stir the solids well with a glass rod.
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Tightly cap the vial and place it by the balances. Set a box of 90-mm circular filter paper by the balances. Make sure that the area has enough weighing boats, laboratory wipes, and clean spatulas.
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Set out the following glassware and equipment at each student lab station (we suggest that students work in pairs):
1 Lab stand with ring fixture |
1 Hotplate |
1 Vacuum pump (or house vacuum) |
1 Medium 3-prong clamp |
1 125-mL separatory funnel with a stopper |
1 125-mL Erlenmeyer flask |
3 10-mL glass graduated cylinders |
2 50-mL glass graduated cylinders |
2 50-mL beakers |
3 100-mL beakers |
1 600-mL beaker |
1 250-mL filter flask |
1 Büchner funnel |
2 60-mL glass funnels |
2 100-mm watch glasses |
2 Glass stirring rods |
2 24/40 rubber adapters |
2 Pasteur pipette bulbs |
2 Small spatulas |
1 Package of pH paper |
1 Roll of lab tape and pen |
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Distribute boxes of lab wipes and Pasteur pipettes around the lab so that each workstation has them nearby.
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Set out anhydrous magnesium sulfate, sodium bicarbonate, vacuum grease, and several spatulas on a common bench.
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Shortly before the lab, place labeled bottles of dichloromethane and 1 M NaOH in a fume hood.
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Put a bottle of 3 M HCl in a separate fume hood to avoid inadvertent contact between acids and bases.