167
Ionic Interactions
NaSO 4
–
SO 4
2–
MgSO 4
KSO 4
–
CaSO 4
HCO 3
–
NaHCO 3
MgHCO 3
+
CaHCO 3
+
MgCO 3
CaCO 3
NaCO 3
–
CO 3
2–
B(OH) 4
–
NaB(OH) 4
CaB(OH) 4
+
MgB(OH) 4
+
F
–
MgF
+
CaF
+
NaF
MgOH +
OH
–
NaOH
CaOH
+
Figure 4.32
The speciation of anions in seawater.
Table 4.9
Comparison of the Measured and Calculated
pK* HA for Acids in Seawater at 25°C
Acid
pK* HA
Calculated
Measured
ΔpK
H 2 O
13.21
13.18
0.03
B(OH) 3
8.59
8.60
–0.01
H 2 CO 3
5.86
5.84
0.02
HCO 3–
8.96
8.93
0.03
NH 4+
9.345
9.351
–0.006
H 3 PO 4
1.55
1.57
–0.02
H 2 PO 4–
6.14
5.94
0.20
HPO 4
2–
9.11
8.93
0.18