Calculate the resolution of two peaks on a 25.0 cm column with 10,000 plates for two solutes with retention factors of 3.75 and 4.15. Assuming nearly identical peak heights will the two compounds be baseline resolved under these conditions?
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Calculate the resolution of two peaks on a 25.0 cm column with 10,000 plates for two solutes with retention factors of 3.75 and 4.15. Assuming nearly identical peak heights will the two compounds be baseline resolved under these conditions?
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- Consider the separation of components A and B on a GC column. The retention time for component A is 1.4 min and for component B is 2.1 min. The width at the base for the peak due toA is 0.38 min and for the peak due to B is 0.53 min. Calculate the resolution, R, and tell whetherthe two peaks are considered to be resolved and why.3A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, te, was found to be 200.8 s with a baseline peak width, we, of 16.1 s. The retention time for aspartame, ta, was 258.7 s with a baseline peak width, wa, of 20.6 s. The retention time for the unretained solvent methanol was 44.2 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.1 cm long column. H = Calculate the resolution, R, for this separation using the widths of the peaks. R = 88.2 R₂5N = 3.16 Calculate the resolution if the number of theoretical plates were to increase by a factor of 2.5. 3.533 Incorrect μm
- Discuss the advantages and disadvantages of sequential versus simultaneous multichannel ICP spectrometers.Substances A, B, C and D were found to have retention times of 8.3 min (A), 10.6 min (B), 12.4 min (C) and 13.5 min (D), respectively on an 15.0 cm long column. There was also an unretained species which appeared at 1.5 min. The widths of the peak bases were 0.90 min (A), 1.1 min (B), 1.3 min (C) and 0.80 min (D). Given this information listed above, please choose the most appropriate answer for the six questions listed below for the list of possible answers. Part A Calculate the capacity factor (k') for peak B and peak D. Part B. Calculate the resolution (R) between peaks B and D. Part C. What do the capacity factor and resolution tell you about the separation of peaks B and D on this column? Part D What are the theoretical plate number (N) for peaks Band D? Part E. What is the average plate height (H), based on the information in Part D and the column length listed above? Part F What would be the required length of a column to achieve a Rs of 2.07Substances A and B have retention times of 12.75 and 14.28 min, respectively, on a 30.0-cm column. An unretained species passes through the column in 1.10 min. The peak widths (at base) for A and B are 1.11 and 1.27 min, respectively. What is the resolution?
- Calculate the separation factor (or selectivity factor), between two compounds, 1 and 2, whose retention volumes are 6mL and 7mL, respectively. The dead volume of the column used is 1mL. Show that this factor is equal to the ratio of the distribution coefficients K2/K1 of these compounds tR(1)<tR(2).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.In a HPLC separation of two compounds, A and B, the retention times observed are 3.5 min. for A and 4.5 min. for B on a 15 cm column. The retention time for the mobile phase is 1.0 min. The peak widths (at the base) for A and B are 0.5 and 0.7 min respectively. Calculate the following: (i) The capacity factor of A and B. (ii) The peak resolution. (iii) The average number of theoretical plates in the column
- TLC was used to compare the solubility of two compounds A and B in a solvent system (acetic acid, methanol, H2O). The distances that solvent has moved in the silica gel TLC was 12 cm. and for the compounds were 2 and 8 cm respectively. (a) Calculate the Rf values and which compound is more soluble and which one is more polar. (b) What are the factors affecting the Rf valueA student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, tc, was found to be 209.6 s with a baseline peak width, w., of 14.4 s. The retention time for aspartame, ta, was 260.0 s with a baseline peak width, wa, of 21.2 s. The retention time for the unretained solvent methanol was 49.2 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.1 cm long column. H = um %3D Calculate the resolution, R, for this separation using the widths of the peaks. R = Calculate the resolution if the number of theoretical plates were to increase by a factor of 2. R2N =A peak with a retention time of 407s has a width at half-height of 7.6 seconds. A neighboring peak is eluted 17 seconds later with w1/2 = 9.4 seconds. What is the difference in retention time required for an adequate resolution of 1.5?
