Thermodynamic functions. Distance from equilibrium. Rate constants, transition state theory, influence of surface area and temperature, potential barrier, dynamic equilibrium. Saturation index. Molar and mass fractions, ionic strength, equivalents. Stability diagrams (systems Si, Al, Fe, Mn, Cu, Zn, Pb - aqueous solutions, forms of occurrence, distribution and stability as a function of pH). Forms of occurrence of substances in water (true and colloidal solutions, suspensions, ions, complexes, ion pairs, organic complexes). Chemical and physical properties of water (structure, bonds, partial charges, dissolution of solid phases, dissolution of gases => partial pressure, Henry's law, dependence of Henry's constant on temperature). Carbonate system (basic components of the system, distribution coefficients, closed and open system, acid-base titrations, buffers, Gran's function). Acid-base reactions (water dissociation, pH, mass balances, electroneutrality condition, proton condition, acidity and alkalinity, methods of determination). Oxidation-reduction processes (electrochemical potentials, Nernst equation, redox potential, mixed potentials, electron activity, electrodes, Eh / pH diagrams). Organic substances (organic carbon, chemical oxygen demand, contaminants of organic origin, biodegradation, humic substances, etc.). Radioactive substances and isotopes in groundwater (separation, structure, fractionation, geochronology, etc.). Methods of hydrogeochemical data processing, geochemical programs. Practical examples.