Question 281 · LDEK · Fluoride
What is the concentration of fluoride ions in a preparation that contains 2500 ppm F⁻?
- A. 2.5%.
- B. 0.25%.
- C. 0.025%.
- D. 0.0025%.
- E. 0.00025%.
Hint
Convert using the rule that 10,000 ppm equals 1%.
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