42. The copper(II) content was determined by amperometric titration. To do this, 50.00 ml of the analyzed solution was titrated with a 0.01 M solution of complexone III in an ammonia buffer medium at a constant external potential E = -0.25 V:
V, (EDTA) ml 0.00 0.50 1.00 1.50 2.00 2.50 3.00
I, μA 19.9 14.0 7.75 1.75 0.50 0.50 0.50
Calculate the copper concentration in the solution (mg/l), determine which substance of the titrated system is polarotropically active, write down the equation of the electrode reaction.

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