1. Against the background of 0.1 M KNO3, Pb(II) forms a wave with E1/2=-0.405 V (NCE) on the RCE. In
the presence of organic ligand A, the following data were obtained:
CA, M 0.020 0.060 0.100 0.300
E1/2, V -0.473 -0.507 -0.516 -0.547.
What is the metal:ligand ratio in the complex, what is its stability constant?

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