On 11.04.2019 Ivo Leito gives a presentation titled “How to make maximum use of the available pKa data in non-aqueous solvents?” at 26th Croatian Meeting of Chemists and Chemical Engineers (26HSKIKI), in Šibenik (Croatia). The presentation discusses the principles of acid-base behaviour in solvents and on how to estimate the pK_a values of compounds in solvents where direct experimental data are not available.