Suppose the Absorbance for a Known Solution Was Calculated to Be

question 8

Multiple Choice

Suppose the absorbance for a known solution was calculated to be 0.333.The solution was measured on a spectrophotometer, and the measured absorbance was 0.321.The solution was prepared again and gave the same absorbance reading of 0.321.Which of the following explanations would most accurately explain the difference between the calculated absorbance and the measured absorbance?

• A)Calculated absorbance is only an estimate of the true absorbance measured by spectrophotometry.
• B)The molar absorptivity of the compound changes over the bandpass of the spectrophotometer.
• C)There may have been an error in the preparation of the solution measured by spectrophotometry.
• D)Measured absorbance is only an estimate of the true absorbance determined by mathematical calculations.

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