V
b
V
a
C
a
1+[]
+
H
K
a
+
H
K
w
[]
+
H
C
b
1+[]
K
w
+
H
K
b
+
H
K
w
[]
+
H
In[]:=
pH=11.9;
In[]:=
Ca=0.1;
In[]:=
Cb=0.1;
In[]:=
H=10^-pH;
In[]:=
Ka=1.75*10^-5;
In[]:=
Kb=0.63;
In[]:=
Kw=1.*10^-14;
In[]:=
Va=10;
In[]:=
Vb=Va*((Ca/(1+H/Ka))-H+Kw/H)/((Cb/(1+Kw/(H*Kb)))+H-Kw/H)