A molecular model of interaction between extremely diluted solutions and NaOH solutions used as titrant.

Conductometric and pHmetric titrations of Extremely Diluted Solutions (EDS) were performed by adding NaOH solutions at concentrations between 1 × 10- 4 and 1 × 10- 3 M. The aim of this work is to obtain further confirmation of the hypothesized presence, in the EDS, of molecular aggregates of water molecules. The measurements on the EDS evidenced some relevant differences compared to those on solutions with just water as solvent. The conductivity and the pH increase caused by the lower concentration of the NaOH base were markedly different to those of the control solutions. We suppose that the preparation procedure of the EDS could produce non-equilibrium changes in the supramolecular structure of water. The experimental results were interpreted by considering the interactions that can take place between the OH- ions and the hypothesized molecular aggregates of water molecules i.e. dissipative structures. A qualitative comparison was made about the nature of the driving force that leads to the formation of the complexes between the two ions H+ or OH- and the molecular aggregates of water molecules (dissipative structures).