If you run a compound on 4 different TLC plates using the following four different solvent systems which solvent system would give the largest Rf value for the compound? pure ethyl acetate 25% heptane and 75% ethyl acetate 50% heptane and 50% ethyl acetate O pure heptane
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If you run a compound on 4 different TLC plates using the following four different solvent systems which solvent system would give the largest Rf value for the compound?
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- 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% pentaneA mixture of biphenyl, benzyl alcohol, and benzoic acid is spotted on a silica gel TLC plate and developed using Ethyl Acetate with 0.5% acetic acid as the solvent. Predict the relative Rf (highest to lowest).A thin-layer chromatography (TLC) experiement was run using three compunds: benzophenone, benzhydrol, and biphenyl. The three solvents that were used with the three compounds were hexane, ethyl acetate, and dichloromethane. Which solvent would be the best for separating these compounds and why?
- You spotted a mixture of three compounds, labeled A-C, on a silica plate. The resulting thin layer chromatography (TLC) plate with a mobile solvent mixture of 95 % hexanes and 5 % ethyl acetate is shown below. Which of the spots traveled the furthest up the TLC plate corresponding to spot 3?A TLC plate showed two spots A and B with Rf 0.20 and 0.30, respectively. Sketch a TLC chromatogram with the above Rf values. (Hint: Start with a 10-cm TLC plate and allow 1 cm each for the start and end solvent fronts.) Determine the distances travelled from the start of the solvent front. ___?____ A ____?___ B Determine the distances left to the end of the solvent front. ___?____ A ____?___ BA Tlc plate was run on the fractions (#1-4) collected from a silica gravity column chromatography thatwas done. The Tlc plate was developed in 20% ethyl acetate/80% hexanes and is shown below.
- i need to caluclate a rf value for the tlc plate and i really need help with showing the steps please! Reduction of 4-Nitrobenzaldehyde to 4-Nitrobenzyl Alcohol and Thin Layer ChromatographyA student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the un-known material a pure compound? What can be done to verify the purity of the sample?If a column was run on the sample shown in lane 3, what would be the first compound to elute off of the column? (assume the same solvent and stationary phase are used) Which of the lanes on this TLC plate show pure compounds? Select all that apply.
- I need to get the rf valuse from a made up value and draw a tlc plate of 30% ethyl actate and 70% peterloume etherA mixture composed of biphenyl, benzoic acid, and benzyl alcohol is spotted on a silica gel TLC plate and eluted with a 10:1 hexanes:ethyl acetate solvent mixture. In what order are the Rf values of the 3 compounds (lowest first)?Internal standard. When 1.06 mmol of 1-pentanol and 1.53 mmol of 1- exanol were separated by gas chromatography, they gave relative peak areas of 922 and 1 570 units, respectively. When 0.57 mmol of pentanol was added to anunknown containing hexanol, the relative chromatographic peak areas were 843:816 (pentanol:hexanol). How much hexanol did the unknown contain?