This study aims to synthesize N-A-S-H gels with Si/Al ratios ranging from 1 to 3 and establish their thermodynamic properties. The synthesis was conducted using a sol-gel method, and the effects of reaction temperature, reaction time, initial Si/Al ratio, reactant concentrations, and pH on the final Si/Al ratio were investigated. The results showed that the target Si/Al ratios could be achieved by controlling the reactant concentrations, pH, and initial Si/Al ratios. The solubility products of the synthesized gels were determined through dissolution tests at different temperatures, providing valuable thermodynamic data. The study also derived thermodynamic properties of the gels, including Gibbs free energy, heat capacity, entropy, enthalpy, and molar volume, based on the experimentally determined solubility products. The findings contribute to the advancement of thermodynamic modeling of geopolymer reactions and phase assemblages.This study aims to synthesize N-A-S-H gels with Si/Al ratios ranging from 1 to 3 and establish their thermodynamic properties. The synthesis was conducted using a sol-gel method, and the effects of reaction temperature, reaction time, initial Si/Al ratio, reactant concentrations, and pH on the final Si/Al ratio were investigated. The results showed that the target Si/Al ratios could be achieved by controlling the reactant concentrations, pH, and initial Si/Al ratios. The solubility products of the synthesized gels were determined through dissolution tests at different temperatures, providing valuable thermodynamic data. The study also derived thermodynamic properties of the gels, including Gibbs free energy, heat capacity, entropy, enthalpy, and molar volume, based on the experimentally determined solubility products. The findings contribute to the advancement of thermodynamic modeling of geopolymer reactions and phase assemblages.