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Beer's law commonly fails at high concentration because

  • A.the absorbing species interact with one another
  • B.the path length changes with concentration
  • C.the detector becomes more sensitive
  • D.the molar absorptivity rises with dilution

Answer: A

Association, ionisation or a change in refractive index alters the absorbing species itself, so the calibration ceases to be linear. Stray light and a non-monochromatic beam cause similar deviations at high absorbance.

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