2. To determine iron (III) in concentrated sulfuric acid in the form of sulfosalicylate, place the sample in a 100.0 ml flask, add the necessary reagents and bring to the mark with water. Measure the optical density at λeff = 420 nm (e = 6.0 * 103) and the thickness of the cuvette l (cm). Calculate the mass of the acid sample for analysis using the following data:
wFe (III), % 0.005
l, cm 3
The optimal value of optical density is 0.435.

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