23. Solving a chemistry problem

23. Solving a chemistry problem

3. Calculate the percentage of cobalt in the oil. 5.0 g of it was wet ashed and diluted to 500 ml in a volumetric flask. The analysis was carried out using the additive method with photometry in a 1.0 cm cuvette under the following conditions
Diluted sample volume, ml Co2 3 µg/ml Reagent, ml H2O, ml Flask volume, ml Optical density
20.0 0 20.0 5.0 50.0 0.398
25.0 5.0 20.0 0 50.0 0.514

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