Acid‐Base Equilibria in the System PbO–SiO 2

The acid‐base equilibria in the liquid silicates in the system PbO–SiO 2 are discussed, Data reported by Richardson and Webb, wherein the PbO activity is determined over a composition range of 0 to 60 mole % SiO 2 , are used for comparison with activities computed from structural models with consideration of the acid‐base equilibria. The results suggest that the liquid silicates in the system PbO–SiO 2 , for the composition and temperature ranges studied, are constituted of a relatively low number of anionic species and that these anions are of a relatively small size (i.e., O 2– , SiO 4– , (SiO 3 ) 3 6− . and (SiO 2.5 ) 6 6− ).