已知 H 3 PO 4 的 p K a =2.12 , p K a =7.20 , p K a =12.36 。求其共轭碱 PO 4 3- 的 pK b1 , HPO 4 2- 的 pK b2 .和 H 2 PO 4 - 的 p K b3 。
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