From Opt52-2 ore sample mass m g containing niobium

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52. Option 2
From the sample of ore mass m z containing niobium, after appropriate work-up 100.00 ml. The volumetric capacity of 25.00 Coble placed 2.00 ml; 3.00 and 3.00 ml of the solution obtained in the third flask was added 1.00 ml of standard containing 10.00 mg / ml niobium. To each flask was added EDTA, tartaric acid and sulfuric acid, lyumogallion IREA, heated to accelerate the reaction of complex formation, cooled and brought up to the mark. The optical density of the second (Aotn.2) and third (Aotn.3) solution was measured with respect to the solution in the first flask.
Calculate the mass fraction (%) of niobium ore for the following options:
Option 2
m = 0,1500 g
Aotn.2 = 0.310
Aotn.3 = 0.495

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