From sample Opt57-2 steel weighing 0.2000 g after sootvets

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57. Option 2
From the sample became 0.2000 g mass after appropriate treatment prepared 100,00 ml solution containing MnO4 (-) and Cr2O7 (2-), and measured its absorbance at filter with λeff = 533 nm and λeff = 432 nm (A533, A432). At six volumetric flasks 100.00 ml placed: 5.00; 8.00; 10.00 ml of the standard permanganate solution (T (Mn) = 0,0001090) or dichromate (T (Cr) = 0,001210), diluted with water to the mark and photometrically under the same conditions.
To determine the mass fraction (%) Mn and Cr in the steel to the following options:
Option 2
Standard solution
V, 5.00 ml of 8.00 10,000 5.00 8.00 10.00 ____
A533 0.230 0.365 0.460 ____ - - -
A432 0.095 0.150 0.190 0.430 0.640 0.780 ____
Test solution:
A533 = 0.330
A432 = 0.760

Additional information

Problems on Optics
Many of the tasks of the "Collection of questions and tasks Analytical Chemistry", ed. Vasiliev VP
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