Beschreibung:
<jats:p>The distribution of hydrochloric acid, water and diisobutylcarbinol (DIBC) between the aqueous and organic phase has been studied at 20°C as a function of acid concentration ranging from 0 to 12 N in the aqueous phase. The density, viscosity, electric conductivity, and dielectric constant of the organic phase have also been measured at 20°C as a function of acid concentration. The acid is extracted as an undissociated ion pair HCl(H<jats:sub>2</jats:sub>O)<jats:sub>2</jats:sub> (DIBC)<jats:sub>2</jats:sub> whose composition is derived from the distribution data. The molecular volume of the extracted species obtained from both densities and viscosities, as well as the center-to-center distance of the ion pair derived from conductivities and dielectric constants are in agreement with this formula. With increasing acid concentration, the organic phase behaves more and more like a strongly polar solvent. Hence, the dissociation constant of the acid in that phase increases by more than 20 orders of magnitude. Beyond 8 N aqueous acid, a second species of lower DIBC-content is extracted in addition to the former one.</jats:p>