2. Acetone, NH4CN5 solution, water were added to 1 ml of solution containing Fe(III), up to 100
ml. Colorimetry was carried out in a cuvette 2 cm long. At 480 nm, the optical density of the colored solution was 0.75, and the molar light absorption coefficient was 1400. Calculate the concentration of Fe(III) in the analyzed solution.

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