Dichloromethane Chemistry Lab
Name Lab Section
GTA Station #
5. Extraction
Pre-lab questions
Complete the following questions and submit before beginning the experiment.
1. Which layer will be the aqueous layer when using dichloromethane (methylene chloride) as the solvent (i.e., top or bottom)? Which layer will be the aqueous layer when using ether as the solvent?
2. When everything has been separated in Part D, which compounds will be in test tubes 1, 2, and 3?
3. The partition coefficient of benzoic acid is 3 in dicholormethane (methylene chloride) with respect to water. If 6 grams of benzoic acid is dissolved into 600 mL of water, how much benzoic acid will be extracted with four by 150 mL portions of dichloromethane (methylene chloride)?
4. In part D, you are to test the aqueous layer with litmus paper after removing the sodium bicarbonate layer. If the paper shows that the extracted layer is neutral, what assumption can you make about the contents of tube 1?
5. Using Schemes 1 and 2 in your handout as references, fill in the …show more content…
Dissolve the solid in exactly 4 mL tert-butyl methyl ether of. Add exactly 2 mL of water, cap the tube and shake. Let the mixture stand until two layers are formed. Remove the aqueous layer. Wash the organic layer two more times with exactly 2 mL of water (each time). After the final wash, dry the organic layer with calcium chloride pellets. Remove the ether with a pipette and filter through a funnel plugged with cotton into a pre-weighed 50 mL beaker including a boiling chip. Wash the pellets with a full pipette of ether. Remove the ether with a pipette and filter through the funnel plugged with cotton into the 50 mL beaker. Evaporate off the ether in the hood on a hot plate under low heat. When the beaker has cooled to room temperature, weigh the
GTA Station #
5. Extraction
Pre-lab questions
Complete the following questions and submit before beginning the experiment.
1. Which layer will be the aqueous layer when using dichloromethane (methylene chloride) as the solvent (i.e., top or bottom)? Which layer will be the aqueous layer when using ether as the solvent?
2. When everything has been separated in Part D, which compounds will be in test tubes 1, 2, and 3?
3. The partition coefficient of benzoic acid is 3 in dicholormethane (methylene chloride) with respect to water. If 6 grams of benzoic acid is dissolved into 600 mL of water, how much benzoic acid will be extracted with four by 150 mL portions of dichloromethane (methylene chloride)?
4. In part D, you are to test the aqueous layer with litmus paper after removing the sodium bicarbonate layer. If the paper shows that the extracted layer is neutral, what assumption can you make about the contents of tube 1?
5. Using Schemes 1 and 2 in your handout as references, fill in the …show more content…
Dissolve the solid in exactly 4 mL tert-butyl methyl ether of. Add exactly 2 mL of water, cap the tube and shake. Let the mixture stand until two layers are formed. Remove the aqueous layer. Wash the organic layer two more times with exactly 2 mL of water (each time). After the final wash, dry the organic layer with calcium chloride pellets. Remove the ether with a pipette and filter through a funnel plugged with cotton into a pre-weighed 50 mL beaker including a boiling chip. Wash the pellets with a full pipette of ether. Remove the ether with a pipette and filter through the funnel plugged with cotton into the 50 mL beaker. Evaporate off the ether in the hood on a hot plate under low heat. When the beaker has cooled to room temperature, weigh the