Question 223 · LDEK · Fluoride
So-called “critical pH”, by which the fluoroapatite is dissolving, is estimated at:
- A. <=4.5.
- B. <=5.0.
- C. <=5.5.
- D. <=6.0.
- E. <=6.5.
Hint
Fluoroapatite has a more stable crystal lattice than hydroxyapatite, so it withstands a lower pH.
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