David Chavez
Arturo Huipe
Chem 221B Lab
January 20, 2016

Experiment 1: Introduction to Microscale (Option A)
1. Weigh a 3-mL conical vial with the screw cap and Teflon insert on a scale. Weight it to the nearest milligram (nearest 0.001 g)
2. Use the automatic pipette and get 0.500 mL of water and put it into the vial, replace the cap assembly (with the insert arranged Teflon side down), and weigh the vial a second time.
3. Find the weight of water dispensed.
4. Determine the density of water. Do the experiment again using 0.500 mL of hexane. Through any excess of hexane in the correct disposal.
5. Determine the density of hexane. The density of water is 0.997 g/mL, and the density of hexane is 0.660 g/mL at room temperature.
Experiment 2: Solubility (Options A-D) …show more content…
Put 40 mg (0.040 g) of benzophenone into each of the four dry test tubes.
2. Name the test tubes and then add 1 mL of water to the first tube, 1 mL of methyl alcohol to the second tube, and 1 mL of hexane to the third tube.
3. The control will be the 4th test tube. Calculate the solubility of each Test tube by using the circular end of the microspatula.
4. Then stir each sample for 60 seconds very fast. Take time how long it takes for the solid to dissolve. Determine if the compound is soluble, insoluble, or partially soluble.
Part B: Solubility of different alcohols
1. Add 1 mL of solvent (water or hexane) to a test tube.
2. Add a Alcohol drop by drop and look at the change that is occurring with each drop.
3. Shake after every drop. Keep on shaking until you have added 20 drops. If partially soluble, the first the drops will dissolve, but a second layer of liquid (undissolved alcohol) will