4. The solution containing Cu2 ions, after adding KI and completion of the reaction, was amperometrically titrated with a solution of Na2S2O3 (T Na2S2O3 = 0.00650 g/mL). Determine the concentration of Cu2 ions in the solution if 14.1 ml of Na2S2O3 were used for titration of 25 ml of this solution

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