A paper chromatography experiment with metal ions gave the following Rfvalues: Ni2 = 0.34, Fe3+ = 0.45, Cr+0.27, Cu2= 0.15. An sample of a metalion was run under similar conditions and the sample moved 2.1 cm with a solventfront of 14.3 cm. Determine the identity of the metal ion. Show calculations.3.

A paper chromatography experiment with metal ions gave the following Rf values: Ni2+ = 0.34, Fe3+ =…

Answered: A paper chromatography experiment with…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter33: High-performance Liquid Chromatography

Section: Chapter Questions

Problem 33.15QAP

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The same polar compound is gas chromatographed on an SE-30 (very nonpolar) column and then on a Carbowax 20M (very polar column). I low will K=cS/cM vary between the two columns?
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Using thin-layer chromatography showed that the black dye used in a brand of writing ink contained blue, red, orange and yellow components. The Rf values of these substances using ethanol as the solvent are 0.59, 0.32, 0.80 and 0.19, respectively. How far apart would the blue and yellow components be after the solvent front had moved 8.0 cm from the origin?
Which statements are true for molecular exclusion chromatography?I Molecular exclusion chromatography separates on the basis of size.II Small molecules that freely pass through the stationary phase, Kav = 0.III Small molecules can fit in the pores of the stationary phase and effectively pass through a larger volume, and elute last.IV The pores in the stationary phase are too small for large molecules to pass through, so large molecules elute last.V Molecular exclusion chromatography with a hydrophilic stationary phase and an aqueous solvent is called gel permeation chromatography. A. II and V B. I, II, and IV C. III, IV, and V D. No correct combinations given above E. I, III, and IV F. I, II, III, and V
The separation of APAP-L,(12 = 0.28 min) from APAP-D (W12 = 0.35 min) on a chiral stationary phase was found to have retention times of 4.78 min and 5.26 min, respectively. With a unretained solute being, found to have a retention time of 1.1 min on the same column. Calculate the column resolution and selectivity factor
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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).
The predominate form of caffeine at pH 9.4 is neutrally charged. If nitromethane, a compound often used as neutral marker, was added to the sample and standard CE vials, predict the impact on the electropherogram, the peak areas, and the determination of caffeine, aspartame and benzoic acid concentrations?
Consider a chromatography experiment in which a mixture of two components, Y (k' =1.4) and Z (k' = 3.8) are injected into a column. The retention time (tR) for the lessretained component, Y is 1.2 min. Calculate Selectivity factor, a of the column.
A student places an unknown sample on a thin-layer chromatography plate and develops it in dichloromethane as a solvent. Only one spot whose Rf is 0.98 is observed. Does this result indicate that the unknown material is a pure compound? If not a pure compound, suggest an alternate procedure to verify the purity of the sample.
In reversed phase HPLC, how will the retention time of a component of a mixture vary with the polarity of its molecules? Explain your answer

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