In binary silicate systems, the alkaline or alkaline-earth oxide reacts with SiO₂ or with a binary silicate compound following a reaction characterized by a constant reaction rate K_p.

The reactions between various components in the binary oxide systems M₂O-SiO₂ (M=Li, Na, K, Rb, Cs) or MO-SiO₂ (M= Ca, Sr, Ba) are of acid-base type. Actually, the reactions take place between different types of ionic oxide species, having different basicity, the equilibrium obviously depending on basicity difference.

Present paper presents for crystalline oxide systems with well defined binary compounds the dependence between the Gibbs free energy of the binary compounds and their basicity, measured through basicity percentage, pB. It was preferred the usage of a derived new thermodynamic parameter, “specific standard free energy”, - DGº₂₉₈/n where n represents the number of moles of an oxide from each single considered crystalline compound.

 The obtained relationships between D^rGº₂₉₈/n and DpB show that the intensity of the reaction between oxides and the level of conversion depends on basicity difference between the reactants.

For vitreous binary alkali-silicate systems there were obtained correlations between standard free energy (- DG⁰₂₉₈) and % wt. SiO₂ or xM₂O and pB [%], resulting various dependences within the series of alkaline oxides. For these vitreous systems, it was determined the dependence of the “specific” standard free energy as function of glass basicity, pB. These are described by strong parabolic correlations.

The obtained correlations basicity-Gibbs free energy are original and show potential for applications within the studied systems, but that can be developed for other crystalline and vitreous oxide systems.