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AP Chemistry
3.13 Beer-Lambert Law
3.11 Spectroscopy and the Electromagnetic Spectrum
IntermediateMCQGraphicalConceptual12.9k
A grayscale line graph plotting Absorbance on the vertical y-axis versus Wavelength in nanometers on the horizontal x-axis. The y-axis runs from 0.0 to 1.0 with labeled tick marks at 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0. The x-axis runs from 400 to 700 with labeled tick marks at 400, 450, 500, 550, 600, 650, and 700. A single solid black curve is shown. Starting at an absorbance of 0.05 at 400 nm, the curve dips to a minimum near 0.02 between 430 nm and 450 nm, rises gradually past 500 nm, increases steeply past 550 nm, reaches a sharp maximum peak at 620 nm with an absorbance value of 0.85, and falls sharply to 0.10 at 700 nm. No other curves, text, or annotations appear.
Absorbance spectrum of the aqueous dye solution from \(400\text{ nm}\) to \(700\text{ nm}\).
A student investigates the spectroscopic properties of an aqueous solution of a food dye. The student collects the absorbance spectrum shown below across the visible wavelength range from \(400\text{ nm}\) to \(700\text{ nm}\).

Wavelength range (\(\text{nm}\))Color of light
\(400 - 480\)Blue / Violet
\(480 - 560\)Green
\(560 - 640\)Orange / Yellow
\(640 - 700\)Red

Based on the spectrum and the table, which of the following identifies the optimal wavelength to construct a Beer's law calibration curve for this dye, and correctly explains the perceived macroscopic color of the solution?

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