Question

3. Match the following water solubility values with the correct structures below: 0.015 g/100 mL, 0.047 g/100 mL, 0.5 g/100 mL, 3.6 g/100 mL, 8.3 g/100 mL NH2 4. When performing the gravity filtration of sucrose from dichloromethane, you pre-wet your filter paper with water. What would result? 5. When performing a basic aqueous extraction with dichloromethane to separate aspirin from your unknown, why is it crucial to mix the two layers (aqueous and organic) thoroughly within the separatory funnel?

Answer 1

3)

a)Benzonitrile=0.5 g/100 mL
b)Toluene=0.047 g/100 mL
c)Phenol=8.3 g/100 mL
d)Aniline=3.6 g/100mL
e)ethylbenzene=0.015 g/100 mL

4)If you pre-wet your filter paper before the gravity filtration of sucrose from dichlorometane, you can clean the recovered sucrose crystal from solvent because sucrose is highly soluble in water and dichlorometane isn't.

5)It's important to mix the two layers (aqueous and organic) thoroughly within the separatory funnel, because you will favor the distribution of each component (Aspirin and unknown) in the phase in which it is more soluble.