The half wave potential of the lead ions was determined at 25℃ in sodium perchlorate-sodium acetate mixture, over a concentration range of 0.01-0.13 M acetate ions,and at an ionic strenth 2.5.The succestve stability constants were found to be:K₁=95.5±3.5;K₂=1350±28;K₃=912±18;K₄=501±15