CaF is formed through the reaction of calcium ions and hydrofluoric acid. This reaction will work best within a certain pH range where the two salt components are predominant.

a. Given that the Ka of hydrofluoric acid is 7.2 10^-4 and the Ka of calcium ion is 1.6 10^-13, create predominance diagrams for the two species (Draw 1 diagram per species).

b. Using your two predominance diagrams, what pH range would be ideal for the formation of calcium fluoride? Why do you think this to be the case?