POTASSIUM FLUORIDE KF

Properties potassium fluoride KF:

White, melts without decomposition. Readily soluble in water (hydrolysis on the anion). Decomposes by acids.


Molar mass g/mol 58.10
Density g/cm3 2.48
Melting point °C 857

Obtaining potassium fluoride KF:

2K + E2 = 2KE (normal temp.; E = F, Cl, Вr, I).

KОН (diluted) + HF(diluted) = KF + H2O

KОН (conc.) + 2HF(conc.) = KHF2 + H2O.

K2CO3 + 2HF(diluted) = 2KF + H2O + CO2↑,

K2CO3 + 4HF(conc.) = 2KHF2 + H2O + CO2↑.

KHF2 = KF + HF (310-400°C).

KHF2 (liquid) → Electrolysis → H2↑ (cathode) + F2↑ (anode) + KF.


Chemical reactions with potassium fluoride KF:

KF·2H2O = KF + 2 H2O (350°C).

KF (diluted) + 6 H2O = [K(H2O)6]+ + F-, F- + H2O ↔ HF + OH-.

KF + HF(conc.) = KHF2,

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

2KF + H2SO4(conc.) = K2SO4 + 2HF↑ (boiling).

KF + LiOH(saturated) = KОН + LiF↓.

2KF (conc.) + H2SiF6 = K2SiF6 ↓ + 2HF.

KF + SO2 (liquid) = KSO2F.

KF(liquid) → Electrolysis 2K↓(on cathode) + F2↑(on anode).


 

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