SODIUM FLUORIDE NaF

Properties of Sodium fluoride NaF:

Villiaumite. White, melts without decomposition. Moderately soluble in water (hydrolysis on the anion), the solubility is only slightly dependent on temperature. Crystalline hydrates do not form. Decomposed by concentrated acids. Participates in the exchange reactions.


Obtaining sodium fluoride NaF:

2 Na + E2 = 2NaE (normal temp., E = F, Cl, Вr, I).

NaOH + HF(diluted) = NaF + H2O

NaOH + 2HF(conc.) = NaHF2 + H2O.

NaOH (conc.) + NH4F (conc.) = NaF + NH3↑ + H2O (boiling)

Na2SiF6 + NaOH (conc., cold) = 6 NaF + Na4SiO4 + 4H2O.

Na2SiF6 + 2Na2CO3 (conc.) = 6 NaF +SiO2↓ + 2CO2↑ (boiling).


Reactions with sodium fluoride NaF:

NaF (diluted) + 4H2O = [Na(H2O)4]+ + F-

F(-) + H2O ↔ HF + ОН(-).

NaF + HF(conc.) = Na(HF2)

NaF + nHF(liquid) = NaF·nHF↓, or Na[F(HF)n] (n = 1 / 4).

2 NaF + H2SO4(conc.) = Na2SO4 + 2 HF↑ (bolilig).

NaF + LiOH (saturated) = NaOH + LiF↓.

2NaF(conc.) + H2[SiF6] = Na2[SiF6]↓ + 2HF.

3NaF(conc.) + AlF3 = Na3[AlF6]↓.

NaF(melt) → Electrolysis 2Na↓(cathode) + F2↑(anode).


 

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