3. Solving a chemistry problem
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3. Solving a chemistry problem
2. In the photometric determination of the iron content in wastewater, the standard method was used, for which 25.0 cm3 of samples and a standard solution of iron with a concentration of 25 μg/ml were used. The optical densities of these solutions at 248.32 nm are 0.350 and 0.640, respectively. Determine the concentration of iron in wastewater (mg/dm3).
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