Abstract
The acid-base properties of hydrous fluorite surfaces and ion exchange reactions between surface lattice ions of F- and OH- ions in bulk solution have been investigated. The measurements were performed as potentiometric titrations with varied solid concentrations in 0.1 mol dm-3 KCl medium at 25.0°C using a glass electrode for -log[H+] and a fluoride ion selective electrode for -log[F-]. The experimental data could be explained by a model that assumes the surface equilibria(≡CaOH12≡F ⇔ ≡CnOH≡F + H+logβs-1100 (int) = -9.5 ± 0.1≡CaOH+2≡F + H+ ⇔ ≡CaOH+2≡FHlogβs-1100 (int) = 4.4 ± 0.1≡CaOH+2≡F + H+ + H2O+ ⇔ ≡CaOH≡OH + 2H+ + F-logβs-210-1(int) = -20.3 ± 0.1The equilibrium constants were evaluated using the computer program FITEQL assuming a constant capacitance model for the electric double layer.
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