3. Calculate the concentration of Pb2+ in the solution if the following data were obtained during titration of 50 ml of this solution with 0.05 M K2Cr2O7 solution (to PbCrO4) at 1.0 V (relative to saturation caloric electrode):
Volume of K2Cr2O7, ml 0 2 4 6 7 8
Current, μA 80 45 12 25 60 93

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