Varnish AKA 5% sodium fluoride (Naf) has what concentration?

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Multiple Choice

Varnish AKA 5% sodium fluoride (Naf) has what concentration?

Explanation:
A 5% sodium fluoride varnish contains about 22,600 ppm fluoride. Here’s why: 5 g of NaF are present in 100 g of varnish. Fluorine makes up about 45.2% of NaF by weight, so fluoride in that 100 g is 5 g × 0.452 ≈ 2.26 g (2260 mg). That amount of fluoride per 100 g scales to 22,600 mg of fluoride per 1 kg of varnish, which is 22,600 ppm.

A 5% sodium fluoride varnish contains about 22,600 ppm fluoride. Here’s why: 5 g of NaF are present in 100 g of varnish. Fluorine makes up about 45.2% of NaF by weight, so fluoride in that 100 g is 5 g × 0.452 ≈ 2.26 g (2260 mg). That amount of fluoride per 100 g scales to 22,600 mg of fluoride per 1 kg of varnish, which is 22,600 ppm.

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