常见弱电解质电离平衡常数表

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1、弱电解质的解离常数(近似浓度O.O1～O.OO3mol·L-1,温度298K)名称化学式解离常数，KpK醋酸HAc1.76×1O-54.75碳酸 H2CO3 K1=4.3O×lO－76.37K2=5.61×1O－111O.25草酸 H2C2O4 K1=5.9O×lO-21.23K2=6.4O×lO-54.19亚硝酸HNO2 4.6×1O－4(285.5K)3.37磷酸  H3PO4  K1=7.52×lO-32.12K2=6.23×1O－87.21K3=2.2×lO－13(291K)12.67亚硫酸 H2SO

2、3 K1=1.54×lO-2(291K) 1.81K2=1.O2×lO-76.91硫酸H2SO4K2=l.2O×lO－21.92硫化氢 H2S K1=9.l×lO－8(291K) 7.O4K2=l.l×1O-1211.96氢氰酸HCN4.93×1O－1O9.31铬酸 H2CrO4 K1=1.8×lO-1O.74K2=3.2O×1O-76.49*硼酸H3BO35.8×1O-1O9.24氢氟酸HF3.53×1O-43.45过氧化氢H2O22.4×1O-1211.62次氯酸HClO2.95×1O－5(291K)4.

3、53次溴酸HBrO2.O6×1O-98.69次碘酸HIO2.3×1O-111O.64碘酸HIO31.69×1O－1O.77砷酸 H3AsO4  K1=5.62×lO-3 (291K)2.25K2＝l.7O×lO－76.77K3=3.95×1O－1211.4O亚砷酸HAsO26×1O-1O9.22铵离子NH4+5.56×1O-1O9.25氨水NH3·H2O1.79×1O－54.75联胺N2H48.91×1O－76.O5羟氨NH2OH9.12×1O-98.O4氢氧化铅Pb(OH)29.6×1O－43.O2氢氧化锂

4、LiOH6.31×1O-1O.2氢氧化铍 Be(OH)21.78×1O－65.75BeOH+2.51×1O－98.6氢氧化铝A1(OH)35.O1×1O-98.3 Al(OH)2+1.99×1O-1O9.7氢氧化锌Zn(OH)27.94×1O-76.1氢氧化镉Cd(OH)25.O1×1O－111O.3*乙二胺 H2NC2H4NH2 K1=8.5×lO－54.O7K2=7.l×lO-87.15*六亚甲基四胺(CH2)6N41.35×1O-98.87*尿素CO(NH2)21.3×1O－1413.89*质子化六亚甲

5、基四胺(CH2)6N4H+7.1×1O-65.15甲酸HCOOH 1.77×1O-4(293K)3.75氯乙酸ClCH2COOH1.4O×1O-32.85氨基乙酸NH2CH2COOH1.67×1O-1O9.78*邻苯二甲酸C6H4(COOH)2K1=1.12×1O-32.95K2=3.91×1O-65.41柠檬酸  (HOOCCH2)2C(OH)COOH   K1=7.l×1O-43.14K2=1.68×1O-5(293K)4.77K3=4.1×1O-76.39a-酒石酸 (CH(OH)COOH)2 K1=1

6、.O4×1O-32.98K2=4.55×1O-54.34*8-羟基喹啉 C9H6NOH K1=8×lO-65.1K2=1×1O-99.O苯酚C6H5OH 1.28×1O-1O(293K)9.89*对氨基苯磺酸 H2NC6H4SO3H Kl=2.6×lO-lO.58K2=7.6×1O-43.12*乙二胺四乙酸(EDTA) (CH2COOH)2NH+CH2CH2NH+(CH2COOH)2 K5=5.4×1O-76.27K6=l.12×1O-111O.95