Tell whether each statement below is true or false, and explain your answer in not more than five sentences.A. The process of separation in chromatography makes it more selective than UV-Visible spectrophotometry.B. The analyst performing colorimetric titration can be a source of systematic error.

(a) Answer - True the process of separation in chromatography is more selective than UV - visible…

Answered: Tell whether each statement below is…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter29: Mass Spectrometry

Section: Chapter Questions

Problem 29.10QAP

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what is chromatography? Explain different types of chromatography and explain how to seperate compounds. indicate stationary phase mobile phase.
6. Mass spectrometry and UV/Vis absorbance spectroscopy can both be used as detectors for liquid chromatography experiments. a. In simple systems, quantifying the concentration of an analyte is usually easier with UV/Vis than with MS. Explain why. b. Because MS is more sensitive and more selective, we often use it for quantitative analysis anyway. Explain how you would design a quantitative LC/MS experiment.
2. A chromatographic column is eluted with a solution containing a mixture of two components, X and Y. The chemical affinity of X for the stationary phase is less than that of Y and the chemical affinity for X for the mobile is greater than that of Y. Which substance will be eluted first? Explain your answer.
Suggest two possible applications for paper chromatography other than the separation of dyes or the identification of metal ions.
What is an evaporative-light scattering detector in chromatography?
One disadvantage of thin layer chromatography is that... it cannot be used for quantitative measurements. O it consumes large volumes of solvents O it cannot analyze volatile samples it cannot be used to analyze many samples simultaneously it requires a large amount of sample for analysis
5. What would be the effect of the following errors in chromatographic work? a. The solvent level in the developing chamber or beaker is higher than the spotted sample b. Too much sample is applied to the paper or plate C. Sample spots are too close to each other d. The paper or plate is allowed to remain in the chamber after the solvent front has reached the top of the paper or plate 6. Differentiate normal phase chromatography from reverse phase chromatography. From which of the two governs the video demonstration in TLC and paper chromatography? How do you say so?
1. How does chromatography separate the components of leave samples? 2. Can you use chromatography to purify a mixture? why? 3. What is Rf value and its significance in chromatography?
K 32 Uses a lamp and a flame for determining the concentrations of metal ions in solutions. a. High performance liquid chromatography b. gas chromatography c. mass spectrometry d. infrared spectroscopy e. UV/VIS spectroscopy f. atomic absorption spectroscopy g. thin layer chromatography
1. In thin layer chromatography (TLC), why do you need to use a pencil in marking the spots, origin, and solvent front and not a marker? 2. Why is it necessary to mark the solvent front immediately? 3. Why do you need to ensure that the loading spot is above the solvent level in paper chromatography? 4. Why do different compounds travel different distances on the piece of paper?
Choose the most accurate descriptions about quantitative analysis using atomic absorption spectrophotometer (AAS). A. The sample was digested with a concentrated acid, the digested solutions were diluted in 10x dilution factor and then was directly injected into AAS. B. AAS instrument can detect elements present only in solid samples C. Desolvation, vaporization, combustion, atomization, and ionization are the processes involved during sample analysis. D. Hollow cathode lamps (HCL) are energy sources that a cathode is made from a platinum element in a glass envelope of an inert filler gas. AAS is the most widely used instrumentation for the analysis of metal and traces metal samples. State one factor from the following is insignificant to AAS. A. Wide range sample analysis B. Effective C. Low cost D. Robust
Choose the most accurate descriptions about quantitative analysis using atomic absorption spectrophotometer (AAS). A. The sample was digested with a concentrated acid, the digested solutions were diluted in 10x dilution factor and then was directly injected into AAS. B. AAS instrument can detect elements present only in solid samples C. Desolvation, vaporization, combustion, atomization, and ionization are the processes involved during sample analysis. D. Hollow cathode lamps (HCL) are energy sources that a cathode is made from a platinum element in a glass envelope of an inert filler gas.

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