17. In the photocolorimetric determination of Fe3 with sulfosalicylic acid from a standard solution with an iron content of 10 mg/cm3, a number of dilutions were prepared in volumetric flasks with a capacity of 100 cm3, optical absorption was measured and the following data were obtained:
Vst, cm3 1.0 2.0 3.0 4.0 5.0 6.0
A 0.12 0.25 0.37 0.50 0.62 0.75
Determine the concentration of Fe3 in the analyzed solutions if their optical absorption is 0.30 and 0.50.

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