56 a. The optical density of a 1.00 * 10–4 mol/l solution of a certain substance was measured at different wavelengths in a cell with an absorbing layer thickness of 5.00 cm (option a), 1.00 cm (options b, d, e), 0, 50 cm (option c). Using the data below, construct the absorption spectrum of the test solution in the coordinates optical density A - wavelength λ, nm.
Select the analytical wavelength at which the greatest accuracy and sensitivity of determining the substance by the spectrophotometric method is achieved, and at the selected wavelength, calculate the molar extinction coefficient of this substance in solution.

Wavelength, nm Optical density
Option
A
350 0.592
355 0.642
360 0.673
365 0.690370 0.700380 0.677 390 0.564
395-
400 0.321
410 0.172
420 0.100
430 0.068
435-
440 0.044
450 0.029
460 0.015
470 0.006
480 0.003
490 0.002
500 0

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