ANSWERS: 3
  • Sounds like a test question.
  • Generally speaking, more analyte = more absorption. 0.30 M is more than 0.080 M, but maybe it's a trick question. What band are you looking at? Is the solution aqueous or in some other solvent?
  • Beer-Lambert tells us that the absorption of light by a solution is directly proportional to the concentration. A=Elc where A=absorbance E=molar attenuation coefficient or absorptivity of the attenuating species l=optical path length in cm c=concentration of the solution in moles/L So if we know that the absorbance is proportional to concentration, then the 0.3M would absorb the most light. This makes perfect sense, more concentrated solution means more solute and hence more particles to absorb light. Hope that help you

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