119. Solving a chemistry problem
To determine iron ions, 100 ml of water after evaporation was treated with o-phenanthroline. This yielded 50 ml of a colored solution. 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 / ml), if the molar absorption coefficient of the solution is 1100.
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