23. Solving a chemistry problem
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4.1 To determine the content of “active chlorine”, 5 ppm of o-toluidine was added to a 95 ml water sample, and after exposure, the optical density was measured at λ=490 nm. The concentration of "active chlorine" according to the schedule was 0.25 mg/l. Calculate the content of "active chlorine" in the water.
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