Q6: You dissolve an unknown compound in DCM and spot it on a TLC plate. The Rf i
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Q6: You dissolve an unknown compound in DCM and spot it on a TLC plate. The Rf is 0.15 when the TLC chamber contains toluene as the eluent (mobile phase). You then try dissolving the compound in acetone and then re-run the TLC plate in the same TLC chamber. Predict the outcome and explain why.
Q7: Consider the general structure of the separatory funnel. Describe two (2) ways in which the glassware's design reflects how it works.
Question 6 2 pts You dissolve an unknown compound in DCM and spot it on a TLC plate. The Rf is 0.15 when the TLC chamber contains toluene as the eluent (mobile phase). You then try dissolving the compound in acetone and then re-run the TLC plate in the same TLC chamber. Predict the outcome and explain why. HTML Editor ParagrapExplanation / Answer
6. Unknown compounds dissolved in DCM and tlc is run
molbile phase = Toluene
Rf = 0.15
Then compound is dissolved in acetone and tlc is run
molbile phase = Toluene
Rf = 0.15
Since the mobile phase is the same in both, the Rf value would also remain unchanged.
The sample in which substance is dissolved is vaporized before running the tlc plate, so no effect will be seen here.
7. Separatory funnel
It is a glassware which is used for the liquid-liquid extraction of a compound.
The outlet is at the base and the inlet is at the top from which solvents and solutions are pured into the funnel.
The compound is dissolved in one solvent and then shaken with an immiscible solvent in which the compound or the impurities will have more solubility. The layers are allowed to settle in the separatory funnel by standing. The lower layer (more denser) is then removed from bottom. More of more density solvent is added and the procedure is repested atleast 3-times to get maximum efficiency.
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