Aqueous complexation reactions (25 °C) | |||||
---|---|---|---|---|---|
No. | Reaction | log K | No. | Reaction | log K |
1 | H2O = OH− + H+ | −14 | 20 | K+ + Cl− = KCl | −1.49 |
2 | Al3+ + 4OH− = AlO2 − + 2H2O | 33.12 | 21 | K+ + OH− = KOH | −0.46 |
3 | Al(OH)2+ = Al3+ + 2(OH)− | −3.41 | 22 | K+ + SO4 2− = KSO4 − | 0.85 |
4 | Al(OH)2+ = Al3+ + (OH)− | −9.05 | 23 | NaAlO2 + 2H2O = Al3+ + Na+ + 4OH− | −18.37 |
5 | Al(SO4) −2 = Al3+ + 2SO4 2− | −4.9 | 24 | Na+ + Cl− = NaCl | −0.78 |
6 | AlSO2 + = Al3+ + SO4 2− | −3.01 | 25 | NaHCO3 = HCO3 − + Na+ | −0.15 |
7 | Ca+2 + HCO3 − + OH− = CaCO3 + H2O | 6.895 | 26 | Na+ + H4SiO4 + OH− = NaH3SiO4(aq) + H2O | 5.99 |
8 | Ca2+ + Cl− = CaCl+ | −0.7 | 27 | Na+ + HCO3 − + OH− = NaCO3 − + H2O | 4.19 |
9 | CaCl2 = Ca2+ + 2Cl− | 0.64 | 28 | Na+ + OH− = NaOH | −0.79 |
10 | CaHCO3 + = Ca2+ + HCO3 − | −1.05 | 29 | Na+ + SO4 2− = NaSO4 − | 0.82 |
11 | Ca2+ + OH− = CaOH+ | −1.15 | 30 | HCO3 − + 9 H+ + 8 e− = CH4(aq) + 3 H2O | 30.742 |
12 | Ca2+ + SO4 2− = CaSO4 | 2.11 | 31 | 2 H2O = O2(aq) + 4 H+ + 4 e− | −86.08 |
13 | HCO3 − = CO2(aq) + OH− | 7.66 | 32 | 2 H+ + 2 e− = H2(aq) | −3.15 |
14 | HCO3 − + OH− = CO3 2− + H2O | −3.67 | 33 | SO4 2− + 8 H+ + 8 e− = S2− + 4 H2O | 20.732 |
15 | HAlO2(aq) + H2O = Al3+ + 3(OH)− | −25.57 | 34 | SO4 2− + 9 H+ + 8 e− = HS− + 4 H2O | 33.65 |
16 | HCl +OH− = Cl− + H2O | 13.33 | 35 | SO4 2− + 10 H+ + 8 e− = H2S + 4 H2O | 40.644 |
17 | H4SiO4 + 2OH− = H2SiO4 2− + 2H2O | 5 | 36 | Fe+3 + e− = Fe+2 | 13.02 |
18 | H2SO4 + 2(OH)− = SO4 2− + 2H2O | 29.02 | 37 | Fe+3 + 4 H2O = Fe(OH) −4 + 4 H+ | −21.6 |
19 | HSO4 − + OH− = H2O + SO4 2− | 12.02 |
Precipitation-dissolution reactions (25 °C) | ||||
---|---|---|---|---|
No. | Mineral | Reaction | log K | Molar volume (dm3/mol) |
1 | Calcite | HCO3 − + Ca2+ + OH− = CaCO3 + H2O | 12.151 | 0.03693 |
2 | Portlandite | Ca2+ + 2OH− = Ca(OH)2 | 5.20 | 0.03300 |
3 | Ettringite | 2Al3+ + 6Ca2+ + 26H2O + 3SO4 2− + 12OH− = Ca6Al2(SO4)3(OH)12·26H2O | 111.03 | 0.71032 |
4 | Quartz | H4SiO4 = SiO2 + 2H2O | 3.98 | 0.02269 |
5 | Gypsum | Ca2+ + SO4 2− + 2H2O = CaSO4·2H2O | 4.58 | 0.07470 |
6 | Hydrogarnet | 2Al3+ + 3Ca2+ + 12OH− = Ca3Al2(OH)12 | 87.68 | 0.14952 |
7 | Friedel’s salt | 2Al3+ + 4Ca2+ + 2Cl− + 4H2O + 12OH− = 2Ca2Al(OH)6Cl·2H2O | 93.07 | 0.27624 |
8 | Thaumasite | 3Ca2++H4SiO4 + SO4 2−+HCO3 −+11H2O +3OH− = CaSiO3·CaSO4·CaCO3·15H2O | 31.70 | 0.32940 |
9 | Monocarboaluminate | 2Al2+ +HCO3 − + 4Ca2+ + 3.68H2O + 13OH− = 3CaO·Al2O3·CaCO3·10.68H2O | 101.45 | 0.26196 |
10 | Pyrite | FeS2 + 2 H+ + 2 e− = Fe+2 + 2 HS− | −18.479 | 0.02394 |