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- Why is sodium chloride added before extraction the aqueous layer with DCM? How does magnesium sulfate break emulsions?Diethyl ether and methylene chloride are generally not suitable for use in recrystallization, but are frequently used as extraction solvents. ExplainDescribe how an emulsion could break down in case it forms in an acid-base extraction or in general.
- Based on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.Acetone and isopropyl alcohol are generally not suitable for use in extraction, but are frequently used as recrystallization solvents. ExplainIf you are performing a solvent extraction using 1M HCl (Density slightly > 1.00 g/mL) and diethyl ether (density = .706 g/mL) which layer is the aqueous layer? which is the bottom and top layer?
- When is a PTFE buret used? _________________________________________________________ _ _________________________________________________________________________________ Describe the recommended method for the manipulation of a buret stopcock during titration. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Why is it necessary to completely fill the rubber tubing of the stopcock with the solution before titration? ________________________________________________ ____________________________________________________________________________________________________________________________________________________Why can't a mixture of water and diethyl ether be used for recrystallization?Using chemical structures, illustrate the differences in weak intermolecular interactions that would occur between both propane and 1-propanol and Carbowax 20M, a polyethylene glycol material. Draw a structure of the polyethylene glycol material to illustrate these interactions. Which of the two compounds do you expect to have longer retention time? Explain.