30) The separation efficiency of capillary columns over packed columns 31) The most common mobile phases in GC are 32) Assume that we using a very nonpolar stationary phase in GC we can guess that clution times for the four following analyte species can be ranked in terms of shortest to longest as: I. benzene II. isopropanol III. Ethanol 3) The thermal conductivity detector, flame-ionization detector, and electron capture detector are respectively sensitive to 4) Predict the elution order of the following solutes in reversed phase HPLC. аз лон ногон

The best choice of mobile phase in a thin layer chromatography experiments is:  Group of answer choices The most volatile solvent possible. The least polar solvent possible. The most polar solvent possible. A mixture of solvents that takes into consideration the polarity of the analyte.

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I have a question with the answer but I don't really understand it. Can you please explain the logic in this question & answer?   For example, the hormone estradiolhas a partition coefficient of 3.2 between 1-octanol and water. How many extractions would need to be completed to recover > 99% from 250 mL of saturated solution using 100 mL of 1-octanol per extraction? The variables given are listed below along with the solution. In this scenario, it would require 5 extractions to recover > 99% of estradiol! Typically extractions are carried out only 2 or 3 times because the partition coefficient is usually larger than 3.2 and there are equal amounts of organic solvent and the aqueous layer.

Rank the compounds in each group in order of increasing basicity. „NH2 NH2 a. NH3 -NH2 -NH2 С. O,N CH; b. d. CgH;NH2 (C;H3);NH –NH2 `N'