ESS102H1 Lecture Notes - Aluminosilicate, Titration, Total Dissolved Solids
Document Summary
Most reactions in the gas-water-rock system involve or are controlled by the ph of the system. These include: acid-base equilibria, including hydrolysis and polymerization by condensation, adsorption, because protons compete with cations and hydroxyl ions compete with anions for adsorption sites the formation of metal-ligand complexes, again because of competition. 3: oxidation-reduction reactions, because oxidation usually produce protons, whereas reduction consumes them the solubility and rate of dissolution of many minerals is strongly ph dependent. The availability of protons in aqueous solutions is assessed generally in terms of ph. In principle, ph provides a measure of proton activity {h+} according to the established relationship ph = -log{h+} (1) The value of {h+} is considered within the infinite dilution concept to be equivalent to proton concentration [h+] in dilute solutions (ionic strength, i < 0. 1, therefore activity coefficient approaches 1, see chapter 2) Protons, like other ions in aqueous solution, are subject to hydration by water to form hydronium (h3o+) ions.
