The mass transfer term "C" depends on which of the following factors? A.type of column B.length of column C.size of solvent particles D.equilibration of analyte particles partitioning between the mobile phase and stationary phase E.interaction between stationary phase and mobile phase
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The mass transfer term "C" depends on which of the following factors?
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- Explain the difference between a. nucleation and particle growth b. occlusion and mixed-crystal formation c. precipitation and coprecipitation7 How is the variation in sample composition in a powder random mix influenced by the proportion of active ingredient particles and by the total number of particles in the sample?5. Which term is INCORRECTLY defined? a. linear range - the range over which the response of an analytical method is proportional to analyte concentration b. dynamic range concentration range over which there is a measurable response to analyte, though the response is not linear c. blank solution - a solution containing all reagents and solvents used in the analysis to which no analyte is deliberately added d. standard solutions - solutions for which the standard deviation is known - 6. True or False: Internal standards correct random error caused by run-to-run variation. a. True b. False
- 16) Which of the following(s) is/are correct? I- Selectivity factor is the amount of time a solute spends in the stationary phase relative to the time it spends in mobile phase II- The retention time for an analyte is the time interval between its injection onto a column and its appearance at the detector at the other end of the column. III- Distribution constant is the ratio of the total solute concentration in the stationary phase to that in the mobile phase. A) I, II and III B) Only II C) I and III D) II and III E) Only III for GC2Which form of chromatography is INCORRECTLY defined? A. partition chromatography – solute equilibrates between the stationary liquid and the mobile phase B. affinity chromatography – solute binds to a molecule specific for the solute C. molecular exclusion chromatography – solute is separated based on size D. adsorption chromatography – solute is adsorbed into solid particles E. ion-exchange chromatography – solute ions of the opposite charge are attracted to the stationary phaseThe absorbance of a 0.5 mM aqueous salicylic acid solution was 0.925. This solution was extracted with 10% ethyl acetate/hexane solution. The absorbance of the extracted aqueous salicylic acid solution at equilibrium was 0.670. a. Find the equilibrium concentrations of SA in the aqueous and the non-aqueous phases. b. Calculate the partition coefficient (K) for the salicylic acid.
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