Compound A has a lower affinity for the stationary phase than compound B and can dissolve well in the mobile phase. In the separation of the mixture of A and B by column chromatography, which compound will be eluted first from the column? Explain
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- Compound A has a lower affinity for the stationary phase than
compound B and can dissolve well in the mobile phase. In the
separation of the mixture of A and B by column chromatography,
which compound will be eluted first from the column? Explain
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- When a mixture of A and B were subjected to paper chromatography, A moved up higher than B. However, neither one moved as high as the solvent. Based on this fact, discuss: c. Can you say anything about relative solubility of A vs B in the solvent used (mobile phase)? ExplainThe compounds biphenyl and naphthalene are presented in a mixture. Can hexane be used as a solvent to separate the compounds by column chromatography with silica gel as the stationary phase? Why or why not.What would happen if a mobile phase of ethyl acetate/triethly amine is used in column chromatography for (3-nitrotoluic acid, 2-naphthol and 1,4-dimethoxybenzene)
- a) What would you see if you ran a Thin Layer Chromatography (TLC) on a mixture of the three solids shown below using silica gel as the stationary phase and ethyl acetate/hexanes as the mobile phase? Whichsolid would have the highest Rf and which would have the lowest Rf? Explain b) Would changing the mobile phase (from part a) and increasing thepolarity by introducing small amount of methanol to the mobile phase change the order ofRf of the above 3 compounds? Explain c) Another type of chromatography is Reverse Phase Chromatography. In this type ofchromatography, the stationary phase is non-polar and the mobile phase is polar. If astudent performed Reverse Phase TLC on the mixture of 3 solids (from part a),what would be the order of Rf’s of the compounds? Which would have the lowest Rf andwhich would have the highest Rf?Can the following two molecules be seperated by column chromatography or recrystalization? ExplainDescribe briefly, but precisely, what you would have done in order to get to this stage. You can assume that you have been given a suitable thin layer chromatography plate.
- A chromatographic column is eluted with a solution containing a mixture of two components, X and Y. The chemical affinity of X for the stationary phase is less than that of Y and the chemical affinity for X for the mobile is greater than that of Y. Which substance will be eluted first? Explain your answer.3. If ferrocene was contaminated with some acetylferrocene after the column, what couldyou do to purify it further?4. Could you use a column to separate a mixture of 3 different compounds? Why or whynot?5. Reverse phase chromatography is a type of column where the stationary phase is verynonpolar. If you were to run a reverse phase column on ferrocene and acetylferrocene,in what order would they elute? How could you test the purity of your samples after thecolumn?In a column chromatography experiment. After purifying compounds by column chromatography, what are two other methods that you can use to confirm the identity of the compounds in each fraction? (other than TLC!) make sure to explain aswell. Thank you