There are many ways of "fluoridating" water. One approach involves adding a salt of the fluoride ion, such as NaF. Calculate the pH of a 0.15 M NaF solution. (HF: K_a = 7.2 x 10^-4)

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NaF is a salt that dissociates into Na+ and F-. F- is the conjugate base of HF and will hydrolyze in water to form OH-, making the solution basic. Using the Kb of F- (Kw/Ka of HF), calculate [OH-], then pOH, and finally pH, which is approximately 8.2.

There Are Many Ways of "Fluoridating" Water