7. Calculate the distribution coefficient and the degree of extraction of nickel ion in the form of nickel dimethylglyoximate between water and chloroform, if its initial concentration in the aqueous phase is 82.0 μg/ml, and the concentration after extraction is 0.2 μg/ml. The ratio of the volumes of the organic and aqueous phases is 1:1.
Answer: D = 409, R = 99.8%.

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