Question

What is the chemical equation of NaF in water with phases?

Answer 1

NaF is prepared by neutralizing hydrofluoric acid or hexafluorosilicic acid (H₂SiF₆), byproducts of the reaction of fluorapatite (Ca₅(PO₄)₃F) (from phosphate rock) from the production of superphosphate fertilizer. Neutralizing agents include sodium hydroxideand sodium carbonate. Alcohols are sometimes used to precipitate the NaF:

HF + NaOH → NaF + H₂O

From solutions containing HF, sodium fluoride precipitates as the bifluoride salt NaHF₂. Heating the latter releases HF and gives NaF.

HF + NaF ⇌ NaHF₂

In a 1986 report, the annual worldwide consumption of NaF was estimated to be several million tonnes.