3. Calculate the molarity of Pb2 in the solution if amperometric titration of 50 ml of this solution with 0.05 M solution of K2Cr2O7 (→PbCrO4) at a potential of 1.0 V (sat. EC) yielded the following data:
V, ml 0 2.0 4.0 6.0 7.0 8.0
I, μA 80 45 12 25 60 93

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