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How does the ratio of silica to sodium oxide affect the viscosity of water glass solutions?
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In water glass solutions, the viscosity is directly influenced by the chemical composition of the mixture. Specifically, the higher the ratio of silica (SiO₂) to sodium oxide (Na₂O), the more viscous the solution becomes.1
This increase in viscosity is also dependent on the overall concentration of these ingredients; higher concentrations of both silica and sodium oxide lead to greater viscosity. This phenomenon occurs because the silicon and oxygen atoms form silicate polymers, linking together via covalent bonds to create large, negatively charged chain or ring structures that incorporate sodium ions and water molecules.1