32.4 Find the optimum thickness of the absorbing layer for photometry of a colored solution of copper dithizonate with a molar absorption coefficient emax equal to 45200 at a copper concentration of 0.2 mg in 25 cm3. The optimum value of optical density is 0.56. The ratio of copper and dithizone (C13H12N4S) in the complex compound is 1:2.

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