136. Задачка по химии №013 675

3. For the determination of iron in industrial water, 25 ml of a colored solution was obtained from 100 ml of water after evaporation and treatment with o-phenanthralin. The optical density of this solution at a layer thickness of 1 cm turned out to be 0.460. Determine the iron content of industrial water (in mg/l) if the molar absorption coefficient of this colored compound is 1100.

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