Qs4. This is a TLC analysis of 3 individual compounds. The plate was run in 20 % ethyl acetate, 80% hexane solvent mixture (eluent). Draw a schematic TLC plate for the same compounds, but when the eluent is 40% ethyl acetate, 60 % hexane. Indicate, what is the most polar and least polar compound (A, B, or C) -- A B C
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- A 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. To get the concentration of amine in this compound, you subject it to spectroscopic analysis. So, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample then you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. Solve for the molecular weight of the compound. The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.According to the following TLC, choose all compounds that are present in the crude sample, before recrystallization? 1 methyl benzoate 2 triphenylmethanol 3 a non-polar impurity such as biphenylPlant pigments in spinach were separated with TLC with cellulose as thestationary phase and 80/20 diethyl ether/acetone mixture as themobile phase. If needed, the solvent structures in the lab Appendix.1. Determine the Rf values of each plant component on this TLC plate.2. Arrange the plant components from most polar to most nonpolar. Please answer both 1 and 2 (picture below is the same question attached )
- A TLC plate was run in cyclohexane:ethyl acetate 4:1, the pure product, 2 starting materials and final product were spotted. what does the tlc tell you about the product.1. Which compound will have the largest Rf value on a TLC plate using 10% ethyl acetate/hexane as a developing solvent: 3- decanone or 3- decanol, toluene or benzoic acid, cyclohexane or cyclooctanone? Explain why?Arrange the following solvents in order of increasing polarity (least polar to most polar): Propyl Amine – Diethyl Ether – Ethyl Acetate- Octane If you ran an unknown sample on a TLC and observed only one spot with a Rf value of 0.95, is it safe to assume that it is a pure compound? If not, how can you check it out using TLC?
- Every spot on a student's TLC plate has an Rf value from 0.1 to 0.2. The student used a 10% ethyl acetate 920%0% pentane mixture as the eluting solvent. What composition might yield better Rf values for separating the compounds? 100% pentane 5% ethyl acetate and 95% pentane 20% ethyl acetate and 80% pentaneif you wanted to makes the spots travel up the TLC plate further, what solvent ration would you choose and why? 1:2 Ethyl acetate/Hexane, 2:3 Ethyl acetate/ Hexane, or 1:1 Ethyl acetate/HexaneChemistry 1)Arrange the following in order of increasing Rf in TLC? 3-pentanone, 3-pentanol,pentane.2) If all your Rfs were too large, what would you do to your solvent system to bring themdown?• What solvent(s) would you try next?3) What would happen if you spotted too much compound on your TLC plate?4) One of the compounds we are examining today has a chiral center.• Which one has a chiral center?• Identify it.
- A semi-purified crude extract(SP) was tested against five known phenolic compounds, namely: (1) Quercetin, (2) Rutin, (3) Gallic acid, (4) Catechin, and (5) Ellagic acid. Answer the following questions: Based on the developed chromatogram, what can you infer about the semi-purified crude extract? Based on the developed chromatogram and your knowledge about TLC, what can you say about compounds 1 and 2? Is TLC the most accurate and reliable chromatographic technique used in analytical chemistry? If yes, why? If not, what is a more accurate and reliable chromatographic technique than TLC?Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error.a. A two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent used was acetone.b. A two-component mixture containing a dicarboxylic acid and tricarboxylic acid gave only one spot with an Rf value of 0.05. The solvent used was hexane.c. When a TLC plate was developed, the solvent front ran off the top of the plate.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. If the TLC chromatogram in the picture was duplicated but using a column, draw the set-up and label approximate spots.