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WG1 - Hydrolysis (and associated equilibria) constants

WG1 - NECTAR for highly hydrolysable (HHC) and/or low-valence state (LVC) cations has prepareed a compilation of the hydrolysis constants of most elements of the periodic table. This work is related to its task of providing reliable, accurate and comprehensive sets of thermodynamic data of systems containing HHE and LVC.

You can find the result of the work in the following periodic table. By clicking in a given element, you can access a PDF file containing its hydrolysis constants (log values) at infinite dilution and T = 298 K gathered from the most relevant literature compilations (in green, recommended values).

Various approaches can be used to predict values at different ionic strengths and in different ionic media (e.g., Extended Debye-Hückel, Specific ion Interaction Theory (SIT) and Pitzer models). The final selection criterion should be based on the availability of proper parameters. More at: Grenthe I. and Puigdomenech I. (eds.), Modelling in Aquatic Chemistry. OECD: Paris, 1997.

1
H
hydrogen
1.008
2
He
helium
4.0026
3
Li
lithium
6.94
4
Be
beryllium
9.0122
5
B
boron
10.81
6
C
carbon
12.011
7
N
nidivogen
14.007
8
O
oxygen
15.999
9
F
fluorine
18.998
10
Ne
neon
20.180
11
Na
sodium
22.990
12
Mg
magnesium
24.305
13
Al
aluminum
26.982
14
Si
silicon
28.085
15
P
phosphorus
30.974
16
S
sulfur
32.06
17
Cl
chlorine
35.45
18
Ar
argon
39.948
19
K
potassium
39.098
20
Ca
calcium
40.078
21
Sc
scandium
44.956
22
Ti
titanium
47.867
Available oxidation states:
Ti(III) & Ti(IV)
23
V
vanadium
50.942
Available oxidation states:
V(IV) & V(V)
24
Cr
chromium
51.996
Available oxidation states:
Cr(II), Cr(III) & Cr(VI)
25
Mn
manganese
54.938
Available oxidation states:
Mn(II) & Mn(III)
26
Fe
iron
55.845
Available oxidation states:
Fe(II) & Fe(III)
27
Co
cobalt
58.933
Available oxidation states:
Co(II) & Co(III)
28
Ni
nickel
58.693
29
Cu
copper
63.546
Available oxidation states:
Cu(I) & Cu(II)
30
Zn
zinc
65.38
31
Ga
gallium
69.723
32
Ge
germanium
72.63
33
As
arsenic
74.922
Available oxidation states:
As(III) & As(V)
34
Se
selenium
78.96
Available oxidation states:
Se(-II), Se(IV) & Se(VI)
35
Br
bromine
79.904
36
Kr
krypton
83.798
37
Rb
rubidium
85.468
38
Sr
sdivontium
87.62
39
Y
ytdivium
88.906
40
Zr
zirconium
91.224
41
Nb
niobium
92.906
42
Mo
molybdenum
95.96
43
Tc
technetium
[97.91]
44
Ru
ruthenium
101.07
45
Rh
rhodium
102.91
46
Pd
palladium
106.42
47
Ag
silver
107.87
48
Cd
cadmium
112.41
49
In
indium
114.82
50
Sn
tin
118.71
Available oxidation states:
Sn(II) & Sn(IV)
51
Sb
antimony
121.76
Available oxidation states:
Sb(III) & Sb(V)
52
Te
tellurium
127.60
Available oxidation states:
Te(-II), Te(IV) & Te(VI)
53
I
iodine
126.90
54
Xe
xenon
131.29
55
Cs
cesium
132.91
56
Ba
barium
137.33
72
Hf
hafnium
178.49
73
Ta
tantalum
180.95
74
W
tungsten
183.84
75
Re
rhenium
186.21
76
Os
osmium
190.23
Available oxidation states:
Os(VI) & Os(VIII)
77
Ir
iridium
192.22
78
Pt
platinum
195.08
79
Au
lead
196.97
80
Hg
mercury
200.59
Available oxidation states:
Hg(I) & Hg(II)
81
Tl
thallium
204.38
Available oxidation states:
Tl(I) & Tl(III)
82
Pb
lead
207.2
Available oxidation states:
Pb(II) & Pb(IV)
83
Bi
bismuth
208.98
84
Po
polonium
[208.98]
85
At
astatine
[209.99]
86
Rn
radon
[222.02]
87
Fr
francium
[223.02]
88
Ra
radium
[226.03]
104
Rf
rutherfordium
[265.12]
105
Db
dubnium
[268.13]
106
Sg
seaborgium
[271.13]
107
Bh
bohrium
[270]
108
Hs
hassium
[277.15]
109
Mt
meitnerium
[276.15]
110
Ds
darmstadtium
[281.16]
111
Rg
roentgenium
[280.16]
112
Cn
copernicium
[285.17]
113
Nh
nihonium
[284.18]
114
Fl
flerovium
[289.19]
115
Mc
moscovium
[288.19]
116
Lv
livermorium
[293]
117
Ts
tennessine
[294]
118
Og
oganesson
[294]
57
La
lanthanum
138.91
58
Ce
cerium
140.12
59
Pr
praseodymium
140.91
60
Nd
neodymium
144.24
61
Pm
promethium
[144.91]
62
Sm
samarium
150.36
63
Eu
europium
151.96
64
Gd
gadolinium
157.25
65
Tb
terbium
158.93
66
Dy
dysprosium
162.50
67
Ho
holmium
164.93
68
Er
erbium
167.26
69
Tm
thulium
168.93
70
Yb
ytterbium
173.05
71
Lu
lutetium
174.97
89
Ac
actinium
[227.03]
90
Th
thorium
232.04
91
Pa
protactinium
231.04
92
U
uranium
238.03
Available oxidation states:
U(IV) & U(VI)
93
Np
neptunium
[237.05]
Available oxidation states:
Np(III), Np(IV), Np(V) & Np(VI)
94
Pu
plutonium
[244.06]
Available oxidation states:
Pu(III), Pu(IV), Pu(V) & Pu(VI)
95
Am
americium
[243.06]
Available oxidation states:
Am(III) & Am(V)
96
Cm
curium
[247.07]
97
Bk
berkelium
[247.07]
98
Cf
californium
[251.08]
99
Es
einsteinium
[252.08]
100
Fm
fermium
[257.10]
101
Md
mendelevium
[258.10]
102
No
nobelium
[259.10]
103
Lr
lawrencium
[262.11]

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