Question

Use of Extraction to Isolate a Neutral Compound from a Mixture Containing an Acid or Base Impurity.

Part 4D

Hi guys I had a question about this lab. I am not sure how to create a flow chart for it as well as what chemical equations it needs. please let me know if you need more information.

layer. In the Optional Exercise, the sample contains a neutrum base impurity; however, a detailed procedure is not given. If you are assigned this exercise, you must create a procedure by using the principles discussed in this in- troduction and by studying the following procedure for isolating the neutral com- pound from an acid impurity. Isolating a Neutral Compound from a Mixture Containing an Acid Impurity. Add 0.150 g of an unknown mixture to a screw-cap centrifuge tube. Add 4.0 mL of ether to the tube and cap it. Shake the tube until all the solid dissolves completely Add 2.0 mL of 1.0 M NaOH to the tube and shake for 30 seconds. Let the layers separate. Remove the bottom (aqueous) layer, and place this in a test tube labeled "Ist NaOH extract." Add another 2.0-ml portion of 1.0 M NaOH to the centrifuge tube and shake for 30 seconds. When the layers have separated, remove the aqueous layer and put this in a test tube labeled "2nd NaOH extract." With stirring, add 6 M HCl dropwise to each of the two test tubes containing the NaOH extracts until the mixture is acidic. Test the mixture with litmus or pH paper to determine when it is acidic. Observe the amount of precipitate that forms. What is the precipitate? Does the amount of precipitate in each tube indicate that all the acid impurity has been removed from the ether layer containing the unknown neutral compound? The drying procedure for an ether layer requires the following additional step compared to the procedure for drying a methylene chloride layer (see Technique 12, Section 12.9, "Saturated Salt Solution"). To the ether layer in the centrifuge tube, add 2.0 mL of saturated aqueous sodium chloride. Shake for 30 seconds and let the layers separate. Remove and discard the aqueous layer. With a clean, dry Pasteur pipette, transfer the ether layer (without any water) to a clean, dry test tube. Now dry the ether layer over granular anhydrous sodium sulfate (see Technique 12, The mixture contains 0.100 g of one of the neutral compounds given in the list in the following table and 0.050 g of benzoic acid, the acid impurity. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

Answer 1

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