4. For nickel α-furyldioximate in chloroform, Eλ = 1.9*104 l/mol*cm. What is the minimum percentage content of Ni in pure aluminum that can be determined by this reagent, if the mass of the sample is 1 g, the volume of the extract is 10.0 ml, the cuvette length (1) = 5 cm. optical density, at which the measurement error does not exceed 10 % is equal to 0.020?

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