(A) Stationary phase
(B) Mobile phase
(C) Column
(D) Fraction
14 . During gravity filtration, a student forgets to heat the solution before running it through
the filter. After capturing the filtrate, the student analyzes the sample via infrared (IR)
spectroscopy and finds none of the desired product in the filtrate. What likely occurred to
the student’s product?(A) The product degraded because of a prolonged filtration time.
(B) The product evaporated with collection of the filtrate.
(C) The product precipitated and is present in the residue.
(D) The product was dissolved in the solvent.
15 . Lactoferrin, a milk protein, is a valuable antimicrobial agent that is extracted from
pasteurized, defatted milk utilizing a column containing a charged resin. This is an
example of which of the following chromatographic techniques?(A) Thin-layer chromatography
(B) Ion-exchange chromatography
(C) Affinity chromatography
(D) Size-exclusion chromatography