A solution of compound Y exhibits an absorbance of 0.320 when analyzed in a 1.00 cm…
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A solution of compound Y exhibits an absorbance of 0.320 when analyzed in a 1.00 cm cuvette at a selected wavelength. Under identical instrumental settings, the molar absorptivity of compound Y at this wavelength is known to be 1.28 × 10³ L mol⁻¹ cm⁻¹.
(a) Calculate the concentration of compound Y in the cuvette, expressing your answer in micromoles per liter.
(b) The same solution is then transferred to a cuvette with a 2.00 cm path length and re-measured without altering any other conditions. Predict the absorbance that would be recorded.
(c) Write the algebraic equation that would describe a new calibration line of absorbance versus concentration if all future standards were measured using the 2.00 cm cuvette instead of the 1.00 cm cuvette.