Discussion
What does a spectrum plotted as absorbance against wavelength reveal?
Answer: C
A spectrum shows where the compound absorbs and how sharply, from which the analytical wavelength is chosen and the chromophores present may be inferred. Concentration follows only once the absorptivity is known, and neither stray light nor path length is displayed. Running a full spectrum before setting up a quantitative method is what identifies the best wavelength and warns of interfering absorption, and skipping it is how a method comes to be built on the wrong peak.
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