Question

Analysis of Panacetin - prelab

1. Why are some safety precautions you should take for this experiment? 2. What is Panacetin composed of? 3. How will sucrose be separated from the other compounds?

Answer 1

1. Avoid contact with
dichloromethane; do not breathe
its vapors.,also there is some gas which is evolved so dont shake it vigorously.

2. Panacetin composed of sucrose,aspirin and one more unknown compound.

3.sucrose should be separated from other compounds by Accurately weigh about 0.400 g of panacetin and transfer

it to a clean, dry 15-mL screw-cap centrifuge tube that has been tared . Measure 8.0 mL of

dichloromethane into the centrifuge tube. Dissolve as much solid as possi-
ble in this solvent by shaking vigorously for several minutes. If necessary,
use a wooden applicator stick to break up any solid lodged in the tip. Bal-
ancing the centrifuge tube against one of equal mass, centrifuge the
mixture for at least three minutes, and then transfer the liquid to a
second screw-cap centrifuge tube , leaving all of the solid behind.
Leave centrifuge tube A (uncapped) under a fume hood until you have fin-
ished the rest of the experiment, to allow any traces of dichloromethane to
evaporate. Then weigh it and calculate the mass of the sucrose it contains.
Record the mass of the sucrose in your laboratory notebook. If requested,
submit the sucrose to your instructor in a tared and labeled vial.