Combine the three aqueous layers and use the process of back extraction to

Combine the three aqueous layers and use the process

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and repeat the process two more times. Combine the three aqueous layers and use the process of back extraction to remove the neutral compound from the solution. Next, add NaOH to the solution and wait until a precipitate forms. Use vacuum
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filtration and isolate the solid, which is the neutral compound. Add drying agent and boiling chips into the tube and evaporate the remaining MtBE. b. In order to separate an organic acid (HA) and a phenol (ArOH), firstly dissolve them into the MtBE solution. Add NaHCO 3 to the solution, and using a pipet, remove the bottom layer of the mixture. This is the aqueous layer. Repeat the process two more times and combine the aqueous into a seperate tue. Using back extraction, remove the phenol from the aqueous layer. Add HCl into the solution and wait until a precipitate forms. Use vacuum filtration and isolate the precipitate. The organic compound has phenol while the aqueous layer has the acid. 6. Simply adding distilled water to the unknown layer will help identify the type of layer. Aqueous layer will be soluble in the DI water and the entire solution will remain mixed. But if the unknown layer is organic, it will not dissolve in the water, and two layers will form. 7. It would be a better choice to use Potassium carbonate in an ether solution containing RNH 2 (base). Since potassium carbonate is basic itself, mixing it with an acid could create a salt NaCl. Nevertheless, the mixture of both basic compounds, potassium carbonate and RNH 2 will remain alkaline. MCAT Questions 8. A. Humic Acid
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9. B. Filtration, followed by basic extraction, followed by evaporation 10. C. Top layer
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  • Fall '13
  • JeramyBaum

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