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11 Nov 2019
Name Last First ID Advance Study Assignment - Chemistry 180 Chromatography A student attempted to determine the identity of an unknown substance using thin layer chromatography (TLC)· The following data was obtained from several different experiments (all distances are in mm) Substance "A Distance to the solvent front Distance traveled by Substance "A 69 28 Substance "B" Distance to the solvent front Distance traveled by Substance "B 82 45 Substance "C Distance to the solvent front Distance traveled by Substance "C 73 48 Unknown Distance to the solvent front Distance traveled by Unknown 51 27 Is it possible to identify the unknown from the data given? If so, identify it. Show all work and explain your reasoning. (Hint: Assume the readings are accurate to 1 m Calculate 4 possible answers for each substance, including the unknown. The lowest and highest answers will give the range. For example, if the distance to the solvent front is 25 mm and the distance that the unknown substance travels is 12 mm, the four possible ratios are 11/24, 11/26, 13/24 and 13/26. The range covered by the decimal equivalents of these values is from the value 0.42 to the value 0.54.) To be identified, the range of the unknown must overlap the range of one (and only one) of the known substances. For example, if the range of ratios for a comparison substance is 0.38 to 0.44, there is overlap. If the range of the comparison substance is 0.33 to 0.41, there is no overlap. Show your calculations and your reasoning clearly, specifically identifying what your mean by "overlap" or "mo overlap 53 Exp. 3 - Chromatography
Name Last First ID Advance Study Assignment - Chemistry 180 Chromatography A student attempted to determine the identity of an unknown substance using thin layer chromatography (TLC)· The following data was obtained from several different experiments (all distances are in mm) Substance "A Distance to the solvent front Distance traveled by Substance "A 69 28 Substance "B" Distance to the solvent front Distance traveled by Substance "B 82 45 Substance "C Distance to the solvent front Distance traveled by Substance "C 73 48 Unknown Distance to the solvent front Distance traveled by Unknown 51 27 Is it possible to identify the unknown from the data given? If so, identify it. Show all work and explain your reasoning. (Hint: Assume the readings are accurate to 1 m Calculate 4 possible answers for each substance, including the unknown. The lowest and highest answers will give the range. For example, if the distance to the solvent front is 25 mm and the distance that the unknown substance travels is 12 mm, the four possible ratios are 11/24, 11/26, 13/24 and 13/26. The range covered by the decimal equivalents of these values is from the value 0.42 to the value 0.54.) To be identified, the range of the unknown must overlap the range of one (and only one) of the known substances. For example, if the range of ratios for a comparison substance is 0.38 to 0.44, there is overlap. If the range of the comparison substance is 0.33 to 0.41, there is no overlap. Show your calculations and your reasoning clearly, specifically identifying what your mean by "overlap" or "mo overlap 53 Exp. 3 - Chromatography
Reid WolffLv2
4 Apr 2019