A calibration curve for a blue dye was obtained at its wavelength of maximum…

CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A calibration curve for a blue dye was obtained at its wavelength of maximum absorbance using a cuvette with a path length of

1.00\,\text{cm}

. The line of best fit for absorbance (

A

) versus concentration (

c

, expressed in millimoles per liter) is

A = 2.15\,c

(a) Determine the molar absorptivity, expressed in

L\,\text{mol}^{-1}\,\text{cm}^{-1}

, for the dye at this wavelength. (b) A solution of the dye produces an absorbance of

0.750

under the same conditions. Calculate the concentration of the solution in millimoles per liter.