A standard solution of containing 6.3 x 10-8 M iodoacetone and 2.0 x 10-7 M p-dichlorobenzene(internal standard) gave peak areas of 395 and 787, respectively in a gas chromatogram. A 3.00-mL unknown solution of iodoacetone was treated with 0.100 mL of 1.6 x 10-5 Mp-dichlorobenzeneand the mixture was diluted to 10.00 mL Gas chromatography gave peak areas of 633 and 520 foriodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00mL of original unknown.

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Answered: A standard solution of containing 6.3 x…

Appl Of Ms Excel In Analytical Chemistry

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ISBN:9781285686691

Author:Crouch

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Chapter4: Least-squares And Calibration Methods

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Problem 3P

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A standard solution of containing 6.3 x 10-8 M iodoacetone and 2.0 x 10-7 M p-dichlorobenzene (internal standard) gave peak areas of 395 and 787, respectively in a gas chromatogram. A 3.00-mL unknown solution of iodoacetone was treated with 0.100 mL of 1.6 x 10-5 M p-dichlorobenzene and the mixture was diluted to 10.00 mL Gas chromatography gave peak areas of 633 and 520 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00 mL of original unknown.
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Next, 2.00 mL of 9.63 mM S was added to 10.00 mL of a solution of unknown concentration of X, and the mixture was diluted to 25.0mL. Chromatographic analysis of this solution produced peak areas of 4822 for X and 4099 for S. What was the concentration of 5 (in mM) of the 25.0mL solution?
2. Thin layer chromatography was performed to find the most effective mobile phase needed to separate a mixture containing three compounds (using silica gel as the stationary phase). TLC analyses were performed using five different mobile phases: (A) pure petroleum ether; (B) 25:75 ethyl acetate:petroleum ether; (c) 50:50 ethyl acetate:petroleum ether (D) 75:25 ethyl acetate:petroleum ether; and (E) pure ethyl acetate. Using the TLC results provided, indicate whether an effective separation was achieved for each of the five mobile phases. Be sure to provide a brief explanation for your answer and identify which mobile phase(s) could be used to offer an effective separation of this mixture using column chromatography. A D E
In a chromatographic analysis, a solution containing 0.0837M toluene and 0.0666M xylene resulted in peak areas of Atoluene= 423 and Axylene= 347. To analyze an unknown sample, 10.0mL of 0.146M xylene was added to 10.0mL of an unknown toluene-containing solution, and the mixture was diluted to 25.0mL. This mixture gave a chromatogram with peak areas of Atoluene= 553 and Axylene= 582. What was the concentration of toluene in the unknown solution?
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A mixture of three components is separated using paper chromatography, and each component is analyzed using absorption. With standards containing 100 ppm of each component run simultaneously, the following data were obtained: cmpd A, 0.72 absorbance; B, 0.55; C, 0.80. For the unknown mixture, the data obtined when run under identical conditions were as follows: cmpd A, 0.15 absorbance, B, 0.84; C, 0.75. a) Calculate the relative percentage composition of the unknown mixture. b) The distances traveled by the three components were 8.5, 6.3, and 5.5 cm, respectively. Sketch the appearance of the paper chromatogram. Label each spot. c) Calculate the Rf values if the solvent front is 18 cm.
A student was given an unknown mixture and was asked to determine its composition by thin layer chromatography using silica gel as a stationary phase and a 50:50 mixture of ethyl acetate:petroleum ether as the mobile phase. The unknown mixture could be composed of compounds A-E. The student ran one TLC plate containing compounds A-E, and a second TLC plate of their unknown mixture. Calculate the R, values for all components identified in these TLC analyses and use this data to determine the composition of the unknown mixture. -+-+-+-+-+- ABCDE Unk
In a 1.10 m gas-liquid chromatographic column the following results were obtained: air, 18.0 s; methyl acetate, 1.98 min.; methyl propionate, 2.24 min; methyl n-butyrate, 7.93 min. The base widths of the last three peaks were: 0.19; 0.23 and 0.79 min, respectively. Calculate the theoretical number of plates and the plate height of each column.
A student used thin layer chromatography to confirm whether he could successfully separate two compounds. Here is the TLC plate he obtained after 30 min. Stationary phase was silica gel and mobile phase was 95 % ethyl acetate and 5 % Hexane mixture.
With the following information for a GC analysis using an internal standard, calculate the percentage of alcohol in the sample. The 1% ethanol standard sample has an ethanol peak area of 711 and a 1-propanol peak area of 9253; 3% is 3536 and 14432 for ethanol and 1-propanol respectively; 5% is 3506 and 10693; 7% is 5874 and 10847 and 9% is 5203 and 7522. The beer sample has an ethanol peak area of 5471 and 1-propanol of 14384. 4.95% 5.15% 5.05% 5.25%
Column chromatography was performed on a mixture containing compounds A, B and C using silica gel as a stationary phase and a 50:50 mixture of ethyl acetate:petroleum ether as the mobile phase. Six individual fractions were collected during the separation, and TLC analysis of the fractions provided the data shown. Evaluate and explain whether this column was successful in separating compounds A, B and C. If the column was not successful, suggest what changes could be made to provide a successful separation of this mixture. 1 2 3 4 5 6

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