15. Solving a chemistry problem

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15. Solving a chemistry problem

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5. To determine the iron ion, 100 ml of water after evaporation was treated with o-phenanthroline. At the same time, 50 ml of colored solution was obtained. The optical density of this solution with a layer thickness of 1 cm turned out to be 0.23. Determine the content of iron ions in water (mg / l) if the molar absorption coefficient of the solution is 1100.

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