HW 1. Students in a lab are attempting to separate benzyl alcohol from benzaldeh
ID: 489185 • Letter: H
Question
HW 1. Students in a lab are attempting to separate benzyl alcohol from benzaldehyde using column chromatography. The benzaldehyde product elutes in fractions 5, 6, and 7 only. Below are differing scenarios of how student groups performed the experiment. Show the expected TLC result for these three fractions (on the same plate based on the scenario: IE. A student loads the crude sample onto the column diluted with too much solvent. 5 6 7 Rationale: The student received a poor separation because the mixture was too dilute, causing a large band to load onto the column, therefore they received both starting material and product in the fractions.Explanation / Answer
A) The polar component (benzyl alcohol) will be selectively separated as the non-polar component would not bind (through non-polar ,dispersion forces of interaction ) with the eluent(mobile phase)
B) The components will be partially adsorbed ,and also the eluent as less adsorbing surface is available.Part separation of the components will take place.Non -adsorbed starting material will not move up the column without being adsorbed.
C)The eluent will move up the column being adsorbed and thereby saturating the column,leaving less or no adsorbing surface for the mixture.No separation would occur as the eluent would saturate the column .
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