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NaOH滴定0.1moLH3PO4 pH A3-+NaOH sp3 pKa△lgKa ▣12 H424A3- 2.16 5.05 sp210 10.0 7.21 9.4 ±0.5% 12.32 5.11 8 H2A+HA2- 6 5.0 pHspi=4.7 4.4 ±0.5% H:A+H2A pHsp2=9.7 2 0 100 200 300 400(T%) H;PO H2PO HP0,2P03pH 0 100 200 300 400 (T%) ±0.5% ±0.5% 10.0 9.4 5.0 4.4 pHsp1= 4.7 pHsp2= 9.7 H3PO4 H2PO4 - HPO4 2- PO4 3- H3A+H2AH2A-+HA2- HA2-+A3- A3-+NaOH sp3 sp2 sp1 NaOH滴定0.1mol·L-1H3PO4 pKa △lgKa 2.16 7.21 12.32 5.05 5.11