17. For the determination of iron in industrial water, 25.00 cm3 of a colored solution was obtained from 200.0 cm3 of water after evaporation and treatment with o-phenanthroline. The optical density of this solution turned out to be 0.460 with a light-absorbing layer thickness of 1.0 cm. Determine the content (mg / cm3) of iron in industrial water if the molar coefficient of light absorption of this compound is 11000.
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