Organic Chemistry, Column questions For separating the 9H-fluorene and benzophenone mixture, you used silica gel as your solidphase, which has a very hydrophilic/polar surface. Instead of using silica gel, what wouldhappen if your solid phase had a hydrophobic/nonpolar surface? Would your compoundselute in the same order or not? Could you use the same eluant(s)? Explain your answers.

Column chromatography is an analytical tool that is employed in the separation of the mixture of…

Answered: For separating the 9H-fluorene and…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 1Q

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Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spotswere detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of the answer onthe spots in the chromatogram shown at the picture.
Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spots were detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of your answers on the spots in the chromatogram shown at the right.
1. What effect will the following factors have on a chromatographic separation? (a) Too strong an adsorbent (b) Collection of large elution fractions
Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spots were detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of the on the spots in the chromatogram shown at the right.
4. When performing a melting point onsolid compound using a melting point apparatus, two melting point determinations were made, One sample, which was 1 mm in height in the capillary, possessed a melting point of 133.0-133.5°C. The other sample was 10 mm in height. What would you expect the approximate melting point to be for this sample, assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the sample) (Give an actual numerical approximation!)(Hint: at what temperature would 1g of ice start melting at? At what temperature would 10g of ice start melting at?)
If you are unsure as to which layer in the separatory funnel is aqueous when extracting an aqueous solution with an organic solvent, how could you settle the issue?
1,8-Cineole is a predominant terpene found in cranberries. The concentration of 1,8-cineole in cranberries was determined using gas chromatography. A 5.00 g sample of freeze-dried cranberry powder was added to 10.0 mL water to form a cranberry extract. The extract was filtered. A 1.00 mL aliquot was added to a 25 ml volumetric along with a known amount of internal standard (d-14 cymene) and diluted to volume with water. Standards were spiked with a fixed amount of d-14 cymene as internal standard. The following data was obtained: 1,8-Cineole (ug/mL); 1,8-Cineole (peak area); d-14 cymene (peak area) 10.0; 1260; 1880 15.0; 1865; 1850 20.0; 2520; 1855 50.0; 6280; 1865 Sample; 1976; 1840 What is the concentration of 1,8-cineole in ug per gram of cranberry? O 398 ug/g O 159 ug/g O 674 ug/g O 796 ug/g O 15.9 ug/g
Here is the procedure: Charge a 35 mL microwave reaction vessel with 12 mL of your vegetable oil and 3 mL of methanol (methanol to vegetable oil approximately at a molar ratio of (6 : 1)). Add 0.12 grams of KOH to the mixture. Heat the solution to 85 °C for 5 minutes with stirring. (Note about microwave accelerated synthesis: The reaction is traditionally performed at 65 °C for 30 minutes under reflux in a vessel open to the atmosphere. Question: Explain the rate acceleration observed in the microwave experiment.
Explain the correlation between the structure of the compounds (b-Carotene, chlorophyll ) and the polarity of the solvent (hexane,70/30 hexane/acetone) that separated the compounds on the column. (TLC plate experiment on spinach)
When you are extracting an aqueous solution with an organic solvent, you are uncertain of which layer in the separatory funnel is aqueous, how would you quickly sort out the issue.
Is it possible to prepare a 17% dye solution from a 4% stock dye solution? Explain your answer.
The surface of the silica gel has a structure that looks like this diagram below. Suppose you used a plate coated with silica gel, with propanone, CH3COCH3, as the solvent for thin-layer chromatography. Sno Suppose also that the mixture you were trying to identify contained • benzaldehyde •benzanilide • phenol 1) rank the Rf Value from large to small 2) name the IMF between each compound and the silica gel OH OH main body of silica structure

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