Fluoride is often added to water as sodium fluoride (NaF). What is the mass percent composition of F in NaF?

Fluoride is often added to water as sodium fluoride (NaF). What is the mass percent composition of F− in NaF? How many grams of NaF must be added to 1500 L of water to fluoridate it at a level of 1.0 mg F−/L?

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