What is the concentration in ppm for Gel 2% Naf fluoride?

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Multiple Choice

What is the concentration in ppm for Gel 2% Naf fluoride?

Explanation:
ppm measures how many milligrams of fluoride are in each kilogram of gel. A 2% NaF gel has 2 grams of sodium fluoride per 100 grams of gel. The fluoride content in NaF is 19/41.99 ≈ 0.452, so the fluoride in 2 grams of NaF is about 2 × 0.452 ≈ 0.904 grams of fluoride per 100 grams of gel. That equals 904 milligrams of fluoride per 100 grams, or 9040 mg per kilogram, which is about 9,050 ppm. So the concentration is roughly 9,050 ppm.

ppm measures how many milligrams of fluoride are in each kilogram of gel. A 2% NaF gel has 2 grams of sodium fluoride per 100 grams of gel. The fluoride content in NaF is 19/41.99 ≈ 0.452, so the fluoride in 2 grams of NaF is about 2 × 0.452 ≈ 0.904 grams of fluoride per 100 grams of gel. That equals 904 milligrams of fluoride per 100 grams, or 9040 mg per kilogram, which is about 9,050 ppm. So the concentration is roughly 9,050 ppm.

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