Part 1 Equilibrium properties of electrolytes: electrolytes - elementary concepts; structure of solutions; interionic interactions; acids and bases; special cases of electrolytic systems. Part 2 Transport processes in electrolyte systems: irreversible processes; common properties of fluxes of thermodynamic quantities; production of entropy, the driving forces of transport phenomena; conduction of electricity in electrolytes; diffusion and migration in electrolyte solutions; the mechanism of ion transport in solutions, solids and polymers melts; transport in a flowing liquid. Part 3 Equilibria of charge transfer in heterogeneous electrochemical systems: structure and electrical properties of interfacial regions; reversible electrodes; potentiometry. Part 4 The electrical double layer: general properties; electrocapillarity; structure of the electrical double layer; methods of the electrical double-layer study; the electrical double layer at the electrolyte-non-metallic phase interface. Part 5 Processes in heterogeneous electrochemical systems: basic concepts and definitions; elementary outline of simple electrode reactions; the theory of electron transfer; transport in electrode processes; methods and materials; chemical reactions in electrode processes; adsorption and electrode processes; deposition and oxidation of metals; organic electrochemistry. Part 6 Membrane electrochemistry and bioelectrochemistry: basic concepts and definitions; ion-exchanger membranes; ion-selective electrodes; biological membranes; examples of biological membrane processes. Appendix A: recalculation formulas for concentrations and activity coefficients. Appendix B: list of symbols.