2. Determine the degree of extraction and residual concentration in the aqueous phase of nickel(II) dimethylglyoximate from 50 ml of an aqueous solution with pH = 8.0 with single (R1) and double (R2) shaking with 5.0 ml of chloroform, if the distribution coefficient is D =410, and the initial concentration of nickel(II) C(aq)=0.25 mol/l.

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