Solubility of Calcium Fluoride

Illustration showing the solubility of CaF2 as a function of pH, represented by the solid blue curve. The predominate form of fluoride in solution is shown by the ladder diagram along the x-axis, with the black rectangle showing the region where both HF and F– are important species. Note that the solubility of CaF2 is independent of pH for pH levels greater than 4.17, and that its solubility increases dramatically at lower pH levels where HF is the predominate species. Because the solubility of CaF2 spans several orders of magnitude, its solubility is shown in logarithmic form.

Figure8.2

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