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When stating the Rf value of a compound, why is it also necessary to state the mobile phase that was used?
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- It's important to mark the solvent front with a pencil after the plate is finished being developed in order to calculate an Rf. Group of answer choices True FalseWould your absorbance value be too high or too low if the level of indicator were above the mark on the pipet when delivered to the flask? Explain your answer.This is a ATR spectrum. In which caffeine/PVA films were measured. Line a) correspond to a pure pva film and the other lines are films at increasing caffeine concentration. Notice that the OH band at around 3200cm-1 decreases at higher caffeine concentrations. However at a certain concentration (line d) such band starts to increase back to the initial intensity. What does that mean? Waht is the chemical meaning for that behavior?
- Which detector is suitable for compounds which do not absorb energy in the uv-vis region? a. UV-Vis detector b. IR detector c. Photodiode array detectorA particular mixture was seperated into three components usin paper chromatography. the Rf value of dye A is 0.78, the Rf of dye B is 0.43 and the Rf of dye C is 0.19. What component of the mixture A,B,C is most attracted in the stationery phase and why?A particular mixture was seperated into three components usin paper chromatography. the Rf value of dye A is 0.78, the Rf of dye B is 0.43 and the Rf of dye C is 0.19. What component of the mixture A,B,C is most soluble in the mobile phase and why?
- What functional group has in the peaks at 1022-1118 cm-1 in determining IR spectrum and why does it removes that functional group peak when adding magnetiteWhy is it common to use CCl4 as a solvent in IR spectroscopy? What drastic change on the IR spectrum would you expect if you were to follow this reaction using IR spectroscopy? You want to take the IR spectrum of acetylene. How would you prepare your sample? Mention all important details of the sample preparation (no need to describe the acquisition)What are the limitations and advantages of Nera-IR spectrometry regarding the functional groups that can be studied in this region.