141. Solving a chemistry problem

141. Solving a chemistry problem

From a sample of steel weighing 0.2000 g after appropriate treatment, 100.0 ml of a solution containing MnO4- and Cr2O72- was prepared, its optical density was measured with light filters with aff = 533 nm and aff = 432 on (A533, A432). Six volumetric flasks with a capacity of 100.0 ml were placed 5.00 8.00 10.00 ml of a standard solution of permanganate (T (Mn) = 0.0001090) or dichromate (T (Cr) = 0.001210), diluted with water to the mark and photometric the same conditions. Determine the mass fraction (%) of Mn and Cr in steel for:
Option 1
КMnO4 K2Cr2O7
V, ml 5.00 8.00 10.0 5.0 8.00 10.0 - - -
A533 0.230 0.365 0.460 - - - 0.280 0.330 0.370
A432 0.095 0.150 0.190 0.430 0.640 0.780 0.82 0.760 0.720

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