1. What order of elution do you expect for the 4 parabens, keeping in mind that the stationary phase is bonded with C18 groups? Justify your answer.

Determine the order of inhibition time of hexane, hexanol and benzene compounds in the reverse phase liquid chromatography column.

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.

thin layer chromatography What would happen to it if you decreased the polarity of the mobile phase? Explain. Please help me this question! Thank you a lot

In column chromatography, a) what constitutes the stationary phase, and b) what is the mobile phase made up of?

Which statement regarding the techniques utilzed in splitless injection for gas chromatographic analysis is NOT true? Select one a. Solvent trapping and cold trapping sharpen the peaks for all components, including the solvent and solutes. b.Cryogenic focusing is required, with an initial column temperature below room temperature, for low boilling Oc In solvent trapping, the Initial column temperature is set 10-20°C below the bolling point of the solvent. d. In cold trapping, the initial column temperature is at least 100°C below the boiling points of the solute of interest. e. In solvent trapping. both solvent and solutes are condensed at the column head.

1. What factors can affect a solute's Rf value in thin-layer chromatography?2. Why is it necessary to follow these steps when conducting the experiment? -No contact with the TLC plate should be made with bare hands.-Spots should have a diameter of no more than 1 mm.-Allow sufficient solvent to saturate the chromatography chamber.