Discuss which conditions are most effective for separating the four compounds, making reference to the resolution, retention, selectivity, efficiency and any other factors you think important in your answer.
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- 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.Underline the organic solvent(s) given that would work for the extraction:dichloromethane-water, acetone-water, benzene-water.Concisely explain why the solvent(s) not underlined do(es) not work.Three sample, X (neutral), Y (basic), and Z (acidic), were mixed and dissolved together in dichloromethane. Propose a method to separate all given sample individually using the combination of liquid-liquid extraction, crystallization, distillation, and sublimation technique.
- If the stationary phase and the compound being tested are both polar, will the retention factor (Rf) likely be smaller or larger than if a nonpolar compound was tested? Why?Which statement is true? Statement 1: In chromatography, the compound mixture moves along with the mobile phase through the stationary phase and the components get separated depending on the degree of interaction and adhesion Statement 2: Compound A is more soluble in the mobile phase compared to compound B. Thus, compound A would most probably have a higher Rf value.Which compound has a retention time of 1.5 minutes
- 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. 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 OH -0-Si-O-Si-O-Si-O- O main body of silica structureUse a suitable model to explain how separation and identification of a mixture of organic compounds can be achieved with a thin layer chromatographic (TLC) technique.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
- The concentration of methylene blue in the sample is estimated through (select the correct) options: refractive index measurement (refractometry). turbidity measurement (turbidimetry). absorbance measurement (spectrophotometry). titration with 2% HCl solution.Column chromatography is also very useful for separating mixtures of organic compounds that are not coloured. Briefly explain how you could use column chromatography for the separation of a colourless mixture, and how you could identify your separated compounds.estimate the composition of these initial samples of distillate using figure 1. Based on the results what conclusion can you draw regarding the relative efficiencies of the two separations?