A calibration line for a food-color dye is described by the linear relationship

CHEMISTRY · Subjective · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A = 25.4c + 0.0062

, where

A

is absorbance and

c

is concentration in mol L

^{-1}

. An unknown dye solution shows an absorbance of

0.438

. Determine the concentration of the unknown solution to three significant figures.