This study investigates the synthesis, solubility, and thermodynamic properties of N-A-S-H gels with varying Si/Al ratios (1–3). The research aims to establish a reliable synthesis route and thermodynamic database for N-A-S-H gels, which are key components in geopolymer materials. The synthesis process involves controlling reaction conditions such as temperature, time, initial Si/Al ratio, reactant concentration, and pH to achieve the desired Si/Al ratio in the gel. The resulting N-A-S-H gels were characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and thermogravimetric analysis (TGA) to determine their chemical composition and structural properties. The solubility products of the N-A-S-H gels were determined through dissolution tests at different temperatures. The results showed that the solubility products increase with temperature, indicating higher solubility at higher temperatures. The study also compared the solubility products of N-A-S-H gels with those of zeolites, finding that N-A-S-H gels have higher solubility than crystalline zeolites. The thermodynamic properties of the N-A-S-H gels were derived from the experimentally determined solubility products at 25°C and validated using high-temperature measurements. The results indicate that the solubility of N-A-S-H gels is significantly influenced by their Si/Al ratio, with higher Si/Al ratios leading to higher solubility. The study highlights the challenges in synthesizing N-A-S-H gels with high Si/Al ratios and the importance of controlling reaction conditions to achieve the desired properties. The findings contribute to the development of thermodynamic models for geopolymer reactions and provide valuable insights into the behavior of N-A-S-H gels in geopolymer systems. The results also emphasize the need for further research to improve the accuracy of thermodynamic data for N-A-S-H gels, particularly for high Si/Al ratios.This study investigates the synthesis, solubility, and thermodynamic properties of N-A-S-H gels with varying Si/Al ratios (1–3). The research aims to establish a reliable synthesis route and thermodynamic database for N-A-S-H gels, which are key components in geopolymer materials. The synthesis process involves controlling reaction conditions such as temperature, time, initial Si/Al ratio, reactant concentration, and pH to achieve the desired Si/Al ratio in the gel. The resulting N-A-S-H gels were characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and thermogravimetric analysis (TGA) to determine their chemical composition and structural properties. The solubility products of the N-A-S-H gels were determined through dissolution tests at different temperatures. The results showed that the solubility products increase with temperature, indicating higher solubility at higher temperatures. The study also compared the solubility products of N-A-S-H gels with those of zeolites, finding that N-A-S-H gels have higher solubility than crystalline zeolites. The thermodynamic properties of the N-A-S-H gels were derived from the experimentally determined solubility products at 25°C and validated using high-temperature measurements. The results indicate that the solubility of N-A-S-H gels is significantly influenced by their Si/Al ratio, with higher Si/Al ratios leading to higher solubility. The study highlights the challenges in synthesizing N-A-S-H gels with high Si/Al ratios and the importance of controlling reaction conditions to achieve the desired properties. The findings contribute to the development of thermodynamic models for geopolymer reactions and provide valuable insights into the behavior of N-A-S-H gels in geopolymer systems. The results also emphasize the need for further research to improve the accuracy of thermodynamic data for N-A-S-H gels, particularly for high Si/Al ratios.