A student performs an experiment to determine the concentration of a colored salt solution by measur — Laboratory Chemistry Question
Question
A student performs an experiment to determine the concentration of a colored salt solution by measuring the absorbance of the solution at the wavelength of maximum absorbance of the salt (λmax) and using Beer’s Law to calculate the concentration. Which of the following could cause the measured concentration to be higher than the actual concentration?
A.
The cuvette is not rinsed with the salt solution after being washed.
B.✓ Correct
The cuvette is not wiped off before it is inserted into the spectrophotometer.
C.
Less than the recommended volume of salt solution is added to the cuvette.
D.
The spectrometer is set to a wavelength different from λmax.
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