A spot of black ink was placed on a strip of fiter paper. The chromatogram was developed using an appropriate solvent. The r is shown below. Which of the following spot is the least soluble in water? OH O E
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- A spot of black ink was placed on a strip of filter paper. The chromatogram was developed using an appropriate solvent. The result is shown below. Which of the following spot is the least soluble in water? OH O E O MHow can you use ion exchange Chromatography to de-ionize water? Please shortly answer at your own words. Answer should be to the point (specific 4-5 lines).A spot of crude plant extract was placed on a glass plate coated with C18 silica gel. The chromatogram was developed using an appropriate solvent. The result is shown below. Which of the following spot is the most soluble in water? Choices: Spot C Spot M Spot E Spot H
- 1. In thin layer chromatography (TLC), explain how the pigments separate on a piece of paper. 2. If the spots are colorless on a TLC plate, how can you make it visible? Enumerate 2 ways and discuss each.Can paper chromatography be used to separate and identify very volatile substances? Why? Please explain comprehensively.Barium sulfate from a 1.300-g sample was contaminated with 9.4 mg of Fe2(SO4)3 and weighed a total of 314.0 mg. Calculate a) the apparent percent BaSO4 (Apparent – the value of analyte concentration obtained when the interference is not considered) b) the true percent BaSO4
- Why chromatography is an important tool for analysis of organic compounds?What is the stationary phase in thin layer chromatography and its polarity? Choices: Cellulose - non-polar Cellulose - polar Silica - non-polar Silica - polarChromatography involves the separation of two or more compounds/ions caused by their molecular interactions with two phases. True False
- Analysis of Percent Organic Matter of * a soil sample was conducted and the data are shown below. Calculate the Percent Organic Matter of the sample. (Write answer with 3 significant figures with no %unit) Deionized water blank Reagent blank Sample with reagent Absorbance 0.001 0.089 1.231 Standard Solution (%) Absorbance 10 20 40 80 100 0.291 0.489 0.889 1.692 2.075How can you use ion exchange Chromatography to de-ionize water? Please shortly write at your own words. (4-5 lines maximum ).A student performed chromatography on a mixture of benzoic acid (C6H5CO₂H), acetophenone (C6H5C(O)CH3) and styrene (C6H5CHCH₂). She used alumina (Al₂O3) as the stationary phase and a 9 : 1 mixture of hexane : ethyl ethanoate as the mobile phase. Rank the order in which the compounds moved, from fastest to slowest. benzoic acid acetophenone styrene