87. The value of the molar coefficient of light absorption of a solution of a complex compound of iron with dimethylglyoxime is 10000. What is the minimum mass of iron that can be determined using this colorimetric reaction if it is produced in a volumetric flask with a capacity of 25 and the optical density of the solution should have a value of at least 0.05 at cuvette thickness 2 cm?
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