Solutions of a colored drug are examined at 575 nm in a glass cuvette with an optical…
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
Solutions of a colored drug are examined at 575 nm in a glass cuvette with an optical path length of 0.750 cm. A best-fit analysis of the calibration data yields the linear equation
Absorbance =9.65c+0.004 (c in mol L⁻¹)
Answer the following questions.
(a) Determine the molar absorptivity of the drug at 575 nm, including proper units.
(b) A quality-control sample gives an absorbance of 0.532 under identical conditions. Calculate its concentration.
(c) State the correct units for molar absorptivity and explain why those units are consistent with the equation above.