Dichloromethane Lab Report

1. Dissolve 1 g of a mixture in 2 ml of dichloromethane.

2. Add 1 ml of 5% HCL in a test tube and shake it for 2 minutes.

3. Le the 2 layers separate. Remove the top layer (aqueous solution) and transfer it to a clean test tube. Label it as TT-1.

4. To the bottom layer add 1 ml of portion of 5% HCL and shake it. When 2 layers are separated, transfer it (top layer) to TT-1 and cork it. This should contain your organic base. Save it for next lab period.

5. The remaining dichloromethane solution should contain the organic acid and neutral compound.

6. To this tube add 1 m of water, shake it and transfer top layer to TT-1 and save it.

7. To the remaining dichloromethane solution add 1 ml of 5 % NaOH, shake it and transfer top layer to a new test tube and label TT-2.

8. To the

To the remaining dichloromethane solutions add 1 ml of water, shake it and transfer top layer to TT-2 cork it and save it.

10. To the dichloromethane if needed add enough fresh dichloromethane to make it 1 ml.

11. Then add 1 g of anhydrous sodium sulfate (solid) and shake it. Decant liquid into another test tube, label it as TT-3 corks it and save it.

Recovery of compounds; (acid, base and neutral)

1. Cool solution in TT-1 and add 10% NaOH dropwise while still on ice bath until the solution is base to litmus paper (turns blue).

2. Collect solid by suction filtration, wash solid with cold deionized water.

3. Scrape solid onto a watch glass and dry it (solid should be a base).

4. Cool the NaOH extract in TT-2 on ice bath and add 10% HCl until the solution is acidic to litmus paper (red).

5. Collect solid by suction filtration, wash with cold water. Scrape solid out on a watch glass and dry it (solid should be your solid).

6. From TT-3, evaporate dichloromethane in a hot water bath in the hood. When it is dry it should contain the natural compound.

7. Determine melting points of all three compounds and match these up with melting points of known compounds from the list and identify