弱电解质的解离常数
AD[color=#006666']弱电解质的解离常数[/color]
(近似浓度O.O1～O.OO3mol?L-1,温度298K)
[color=#ffffff']名称[/color]
化学式
解离常数，K
pK
[color=#000000']醋酸[/color]
HAc
1.76×1O-5
4.75
[color=#000000']碳酸 [/color]
H2CO3
[i]K[/i]1=4.3O×lO－7
6.37
[i]K[/i]2=5.61×1O－11
1O.25
[color=#000000']草酸 [/color]
H2C2O4
[i]K[/i]1=5.9O×lO-2
1.23
[i]K[/i]2=6.4O×lO-5
4.19
[color=#000000']亚硝酸[/color]
HNO2
4.6×1O－4
(285.5K)
3.37
[color=#000000']磷酸 [/color]
[color=#000000'] [/color]
H3PO4
[i]K[/i]1=7.52×lO-3
2.12
[i]K[/i]2=6.23×1O－8
7.21
[i]K[/i]3=2.2×lO－13
(291K)
12.67
[color=#000000']亚硫酸 [/color]
H2SO3
[i]K[/i]1=1.54×lO-2 (291K)
1.81
[i]K[/i]2=1.O2×lO-7
6.91
[color=#000000']硫酸[/color]
H2SO4
[i]K[/i]2=l.2O×lO－2
1.92
[color=#000000']硫化氢 [/color]
H2S
[i]K[/i]1=9.l×lO－8 (291K)
7.O4
[i]K[/i]2=l.l×1O-12
11.96
[color=#000000']氢氰酸[/color]
HCN
4.93×1O－1O
9.31
[color=#000000']铬酸 [/color]
H2CrO4
[i]K[/i]1=1.8×lO-1
O.74
[i]K[/i]2=3.2O×1O-7
6.49
[color=#000000']*硼酸[/color]
H3BO3
5.8×1O-1O
9.24
[color=#000000']氢氟酸[/color]
HF
3.53×1O-4
3.45
[color=#000000']过氧化氢[/color]
H2O2
2.4×1O-12
11.62
[color=#000000']次氯酸[/color]
HClO
2.95×1O－5 (291K)
4.53
[color=#000000']次溴酸[/color]
HBrO
2.O6×1O-9
8.69
[color=#000000']次碘酸[/color]
HIO
2.3×1O-11
1O.64
[color=#000000']碘酸[/color]
HIO3
1.69×1O－1
O.77
砷酸
H3AsO4
[i]K[/i]1=5.62×lO-3 (291K)
2.25
K2＝l.7O×lO－7
6.77
[i]K[/i]3=3.95×1O－12
11.4O
[color=#000000']亚砷酸[/color]
HAsO2
6×1O-1O
9.22
[color=#000000']铵离子[/color]
NH4
5.56×1O-1O
9.25
[color=#000000']氨水[/color]
NH3?H2O
1.79×1O－5
4.75
[color=#000000']联胺[/color]
N2H4
8.91×1O－7
6.O5
[color=#000000']羟氨[/color]
NH2OH
9.12×1O-9
8.O4
[color=#000000']氢氧化铅[/color]
Pb(OH)2
9.6×1O－4
3.O2
[color=#000000']氢氧化锂[/color]
LiOH
6.31×1O-1
O.2
[color=#000000']氢氧化铍 [/color]
Be(OH)2
1.78×1O－6
5.75
BeOH
2.51×1O－9
8.6
[color=#000000']氢氧化铝[/color]
A1(OH)3
5.O1×1O-9
8.3
[color=#000000'] [/color]
Al(OH)2
1.99×1O-1O
9.7
[color=#000000']氢氧化锌[/color]
Zn(OH)2
7.94×1O-7
6.1
[color=#000000']氢氧化镉[/color]
Cd(OH)2
5.O1×1O－11
1O.3
[color=#000000']*乙二胺 [/color]
H2NC2H4NH2
[i]K[/i]1=8.5×lO－5
4.O7
[i]K[/i]2=7.l×lO-8
7.15
[color=#000000']*六亚甲基四胺[/color]
(CH2)6N4
1.35×1O-9
8.87
[color=#000000']*尿素[/color]
CO(NH2)2
1.3×1O－14
13.89
[color=#000000']*质子化六亚甲基四胺[/color]
(CH2)6N4H
7.1×1O-6
5.15
[color=#000000']甲酸[/color]
HCOOH
1.77×1O-4 (293K)
3.75
[color=#000000']氯乙酸[/color]
ClCH2COOH
1.4O×1O-3
2.85
[color=#000000']氨基乙酸[/color]
NH2CH2COOH
1.67×1O-1O
9.78
[color=#000000']*邻苯二甲酸[/color]
C6H4(COOH)2
[i]K[/i]1=1.12×1O-3
2.95
[i]K[/i]2=3.91×1O-6
5.41
[color=#000000']柠檬酸 [/color]
[color=#000000'] [/color]
(HOOCCH2)2C(OH)COOH
[i]K[/i]1=7.l×1O-4
3.14
[i]K[/i]2=1.68×1O-5 (293K)
4.77
[i]K[/i]3=4.1×1O-7
6.39
[color=#000000']a[/color]
-酒石酸
(CH(OH)COOH)2
[i]K[/i]1=1.O4×1O-3
2.98
[i]K[/i]2=4.55×1O-5
4.34
[color=#000000']*8-羟基喹啉 [/color]
C9H6NOH
[i]K[/i]1=8×lO-6
5.1
[i]K[/i]2=1×1O-9
9.O
[color=#000000']苯酚[/color]
C6H5OH
1.28×1O-1O (293K)
9.89
[color=#000000']*对氨基苯磺酸 [/color]
H2NC6H4SO3H
[i]K[/i]l=2.6×lO-l
O.58
[i]K[/i]2=7.6×1O-4
3.12
[color=#000000']*乙二胺四乙酸(EDTA) [/color]
(CH2COOH)2NH CH2CH2NH (CH2COOH)2
[i]K[/i]5=5.4×1O-7
6.27
[i]K[/i]6=l.12×1O-11
1O.95
摘自R.C.Weast,Handbook of Chemistry and Physics D- 165,7Oth. edition
,1989―199O
*摘自其他参考书。
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