Abstract
An undergraduate laboratory experiment is designed for the simultaneous determination of both Co(II) and Cr(III) in unknown liquid mixtures based upon a bilinear least squares regressional analysis of measured absorbance data. Unlike several published laboratory experiments, in our method standard solutions contain both ions. Numerical values of the four molar absorpti-vities are calculated from a least squares of analysis of the Beer-Lambert law expression for two light-absorbing species. From an educational standpoint, our modification gives students greater exposure to standard curve-fitting techniques and provides a convenient means to introduce computer programming and/or spreadsheet computations into the laboratory portion of the course. Cobalt (II) and chromium (III) concentrations determined using the bilinear regression method fall within 1-2 % of the correct values.
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