21.83 mL of a Pb2 solution, containing excess Pb2 , was added to10.75 mL of a 2,3-dimercapto-1-propanol (BAL) solution of unknownconcentration, forming the 1:1 Pb2 –BAL complex. The excess Pb2 wastitrated with 0.0141 M EDTA, requiring 8.86 mL to reach theequivalence point. Separately, 40.70 mL of the EDTA solution wasrequired to titrate 31.00 mL of the Pb2 solution. Calculate the BALconcentration, in molarity, of the original 10.75-mL solution.
