A compound is analyzed via TLC. The distance from the origin to the solvent front was found to be 63 mm. and the distance from the origin to the compound spot was found to be 28 mm. What is the R+ value for this compound?
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- ▪ True or False: In an untargeted analysis by GC-MS, we extract all acidic drugs and all basic drugs using SPE with hydrophobic resin. A)True B)False ▪ In a comprehensive drug screen by GCMS, we set the detector to what mode and why? ▪ A) Full scan; we don't know what analyted are in the sample, so we don't know what m/z to focus the detector's time on. ▪ B) SIM; We have a good idA 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. To get the concentration of amine in this compound, you subject it to spectroscopic analysis. So, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample then you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. Solve for the molecular weight of the compound. The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.A student runs a TLC of a sample using a nonpolar development solvent. The TLC shows one spot. The MP of the same sample is 115.5 - 118.2 oC. What can we conclude from the experimental results. Group of answer choices The incorrect development solvent was used. The sample is pure. The sample is non polar. The sample is polar.
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- Both UV/Vis and IR spectrometers can be used for quantitative analysis of analytes. True FalseLook up the boiling point for each of the following compounds then determine the order that they will elute from the column. Use this elution order to identify the compound in each of the 6 standard chromatograms. Once you have identified the compound in each chromatogram, record its retention time. Compound Structure Compound Name Elution Order (1-6) Non polar → Polar Boiling Retention Time (From Chromatograms) Point Propyl acetate H H. H. Butyl acetate H. H. H H. H H. H. H. Methanol H O- Ethanol 2-butanone H H H. H. 4-methyl-2- pentanone H. H. HH H.As solvent polarity increases, the Retention Factor (Rf) of compounds on the TLC plate increases. Group of answer choices True False
- Please answer 1D. how would the Rf values change if eluted with hexanes using an alumina TLC plate? I think that an alumina plate is more polar than a silica plate, so I am inclined to say that this would increase the Rf values. But, I also know that hexanes are non-polar, so I am not sure if they would move up a very polar surface or not. Thanks!Polarities of analyte functional group increase in the order of hydrocarbon < ethers < esters < ketones < aldehydes < amides < amines < alcohols Arrange the order of elution [from shortest to longest retention time] for the following six compounds from an HPLC C18 column. C2H5OH CH3COCH3 CH3COOH CH3COOC2H5 C2H50C2H5 (СН3)2NH O A. C2H5OH < CH3COOH < (CH3)2NH < CH3COCH3 < CH3COOC2H5A mixture of tert-butylbenzene and acetophenone is adsorbed onto a silica gel chromatography column and eluted with a moderately polar solvent such as dichloromethane. Match each statement to the appropriate category. least polar tert-Butylbenzene elutes first most polar elutes last Answer Bank AcetophenoneSEE MORE QUESTIONS