| K | Use (D denotes equillibrium) | Name | Equation | In General | Units/Assume | Other |
| Kc | H2(g) + I2(g) D 2HI(g) | Equilibrium Constant | Kc = [HI]2 | Kc = [products]Pmoles | No units in this case | |
| [H2][ [I2] | [reactants]Rmoles | |||||
| Kc | 3In2(aq) D 6In(aq) | Equilibrium Constant | Kc = [In(aq)]6 | Units are | Units = mol3 dm-9 | |
| . [In2(aq)]3 | (mol dm-3)(pmoles/rmoles) | |||||
| Kc | resin-H+(s) + Na+ D resin-Na+(s) + H+(aq) | Partition Coefficient | Kc = [CO2(aq)] | Kc = [solvent B] | No units in this case | Pressure->shift to |
| CO2(g) D CO2(aq) | (special case of Kc) | Pressure of CO2(g) | [solvent A] | Equation not required | RHS, Kc increase | |
| Kow | NH3(aq) D NH3(CHCl3) | (special case of | Kc = [NH3(CHCl3)] | Kow = [in organic solvent] | No units in this case | |
| partiton coefficient) | [NH3(aq)] | [in water] | Assume: excess solvent | |||
| Ksp | CaCO3(s) D Ca2+(aq) + CO32-(aq) | Solubility Product | Ksp = [Ca2+(aq)][CO32-(aq)] | Ksp = [anion]max[cation]max | Units = mol2 dm-6 | |
| Units= mol2dm-6 (normally) | Assume: excess solid | [Ca2+]=[CO32-] | ||||
| Ka | CH3COOH(aq) D CH3COO-(aq) + H+(aq) | Acid Dissociation | Ka = [H+(aq)] [CH3COO-(aq)] | Ka = [H+(aq)] [A-(aq)] | Units = mol dm-3 | or Ka =[H+(aq)] x [salt] |
| ethanoic acid (weak acid HA) D sodium ethanoate (salt A-) + H+ | Constant | [CH3COOH(aq)] | [HA(aq)] | Assume: excess A- (from salt), [HA] constant | [acid] .[H+] constant | |
| Kw | H2O(l) D H+(aq) + OH-(aq) | Ionic Product of water | Ka = [H+(aq)] [OH-(aq)] | Simplified to [H+(aq)]2 | Assume: excess water | @298K, Kw = 10-14 |
| or 2H2O(l) D H+(aq) + OH-(aq) | (special case of Ka) | [H2O(l)] | ([H+] = [OH-] = 10-7mol dm-3) | Note pH= -log[H+]= -log Ö(Kw) | = 7 | |