4. In a 250 ml volumetric flask, a 1 g sample of CuSO4•5H2O was dissolved in distilled water, with a mass fraction of impurities in salt of 2.4%. An aliquot of the solution with a volume of 2 ml was placed in a 25 ml volumetric flask and the solution was brought to the mark. The degree of extraction of copper ions by the sorbent from the resulting solution is 98%. Determine the concentration of Cu2+ (g/ml) in the solution after sorption.
Answer: C(Cu2+)=1.6•10-6 g

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