常见弱酸弱碱的电离平衡常数

名称化学式Ka砷酸H3AsO46.2X10-3(Ka1)1.2X10-7(Ka2)3.1X10-12(Ka3)亚砷酸H3AsO35.1X10-10硼酸H3BO35.8X10-10次溴酸HBrO2.3X10-9氢氰酸HCN6.2X10-10氰酸HCNO3.3X10-4碳酸H2CO34.45X10-7(ka1)4.7×10-11(ka2)次氯酸HClO2.98X10-8亚氯酸HClO21.1X10-2铬酸H2CrO43.2X10-7(Ka2)氢氟酸HF6.8X10-4次碘酸HIO2.3X10-11碘酸HIO30.49亚硝酸HNO27.1X10-4过氧化氢H2O22.2X10-12次磷酸HPO35.9X10-2磷酸H3PO47.11X10-3(Ka1)6.23X10-8(Ka2)4.5X10-13(Ka3)焦磷酸H4P2O70.20(Ka1)6.5X10-3(Ka2)1.6X10-7(Ka3)2.6X10-10(Ka4)亚磷酸H3PO33.7X10-2(Ka1)2.9X10-7(Ka2)氢硫酸H2S1.3X10-7(Ka1)7.1X10-15(Ka2)硫酸H2SO41.02X10-2(Ka2)亚硫酸H2SO31.23X10-2(Ka1)5.6X10-8(Ka2)硫氰酸HSCN0.13硫代硫酸H2S2O30.25(Ka1)1.9X10-2(Ka2)偏硅酸H2SiO31.7X10-10(Ka1)1.6X10-12(Ka2)甲酸HCOOH1.80X10-4草酸HOOC-COOH5.60X10-2(Ka1)5.42X10-5(Ka2)乙酸CH3COOH1.75X10-5丙酸C2H5COOH1.34X10-5乳酸（D-2-羟基丙酸）CH3CH(OH)COOH1.38X10-4苯酚C6H5OH1.0X10-10苯甲酸C6H5COOH6.28X10-5水杨酸（2-羟基-苯甲酸）C7H6O31.0X10-3(COOH)2.2X10-14(OH)邻苯二甲酸C8H6O41.12X10-3(Ka1)3.91X10-6(Ka2)柠檬酸（2-羟基-1，2，3-丙三羧酸）C6H8O77.44X10-4(Ka1)1.73X10-5(Ka2)4.02X10-7(Ka3)名称化学式Kb一水合氨NH3·H2O1.8X10-5联氨（肼）N2H43.0X10-6(Kb1)7.6X10-15(Kb2)苯胺C6H5NH24.2X10-10羟胺NH2OH9.1X10-9甲胺CH3NH24.2X10-4乙胺C2H5NH25.6X10-4