2. To determine the iron (III) in the form of a sulfosalicilate, the hitch is placed in a measured flask with a capacity of 50 ml, the necessary reagents are added, the water is brought to the labels and the optical density is measured at 429 nm and the thickness of the layer of 3 cm. It turned out to be flat 0.62. The molar coefficient of light absorption is (6.10) 3. Calculate the weight of the hitch (d) of iron for analysis, if the mass fraction of iron in it is 0.005%.
Answer: 1.9 g

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