121. Solving a chemistry problem
3. Determine the concentration of Pb2 ions (mg / l), if during amperometric titration with 10.0 ml Na2SO4 solution with a lead titer of 0.0064 g / ml at E = -1.0 V (NCE) the following data were obtained:
V(Na2SO4), ml 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
Id, μA 215 163 115 60 40 33 30 29
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