AP Chemistry
3.13 Beer-Lambert Law
A student uses a spectrophotometer to determine the concentration of an unknown \(\text{CuSO}_4\text{(aq)}\) solution. The student first constructs a calibration curve by measuring the absorbance of several standard solutions of known concentration at \(\lambda = 635\text{ nm}\), establishing a direct relationship between absorbance and concentration. Before measuring the unknown \(\text{CuSO}_4\text{(aq)}\) solution, the student rinses the cuvette with distilled water but does not dry the interior or rinse it with the unknown solution, leaving several drops of distilled water inside the cuvette. Which of the following best explains how this error affects the measured absorbance and the calculated concentration of the unknown \(\text{CuSO}_4\text{(aq)}\) solution?
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