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.A 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 μmDiscuss the advantages and disadvantages of sequential versus simultaneous multichannel ICP spectrometers.
- Substances 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).Two components of a 12-mg sample are adequately separated by chromatography through a column 1.5 cm in diameter and 25 cm long at a flow rate of 0.8 mL/min. What size column and what flow rate should be used to obtain similar separation with a 250-mg sample?
- Substances A and B have retention times of 16.40 and 17.63 min, respectively,on a 30.0-cm column. An unretained species passes through the column in 1.30 min. The peakwidths (at base) for A and B are 1.11 and 1.21 min, respectively. Calculate(a) the column resolution,(b) the average number of plates in the column,(c) the plate height,(d) the length of column required to achieve a resolution of 1.5.A 5.3 × 10-2 M solution is to be used to prepare a series of five 100 mL solutions of varying concentration for use in creating a calibration curve for a spectrophotometric experiment. Determine the concentrations of each of the five dilutions if 10 mL aliquots of the current solution is used for V1.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.
- 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 =One method for the quantitative determination of the concentration of constituents in a sample analyzed by gas chromatography is area normalization. Here, complete elution of all the sample constituents is necessary. The area of each peak is then measured and corrected for differences in detector response to the different eluates. This correction involves dividing the area by an empirically determined correction factor. The concentration of the analyte is found from the ratio of its corrected area to the total corrected area of all peaks. For a chromatogram containing three peaks, the relative areas were found to be 16.4, 45.2 and 30.2, in order of increasing retention time. Calculate the percentage of each compound if the relative detector responses were 0.60, 0.78 and 0.88, respectively.