4. Calculate the concentration of Fe3 (in mg/l) and the molar absorbance of the colored (with sulfosalicylic acid) solution analyzed by spectrophotometry at λ = 416 nm in a cuvette with ℓ = 2 cm, if the optical density of the standard solution with a concentration of 2.0 mg /l is equal to 0.285. The optical density of the test solution was 0.450.
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