Ammonium fluoride is a crystalline, noncombustible inorganic compound represented by the chemical formula NH4F or FH4N <1, 2>. It is a fluoride salt through ammonium as the counterion and is corrosive to cement, glass, and also most steels, consisting of aluminum <1, 2>.

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Ammonium Fluoride Identification

CAS Number12125-01-8 <1>
PubChem CID25516 <1>
ChemSpider ID23806 <3>
UN Number2505 <1>
UNII4QT928IM0A <1>
EC Number235-185-9 <1>
RTECS NumberBQ6300000 <1>


Ammonium Fluoride Formula

How is Ammonium Fluoride Prepared

It is synthesized by the enhancement of ammonia gregarding cold hydrofluoric acid at a temperature of around 10 °C stood for by the reactivity <4>:

NH3 + HF → NH4F

It deserve to be prepared by making use of silicon tetrafluoride gas (SiF4) and high purity ammonia (NH3) as reactants, which is offered in the adhering to equations <4>:

3SiF4 + 2H2O → 2H2SiF6 + SiO2

H2SiF6 + 2NH3 → (NH4)2SiF6

(NH4)2SiF6 + 4NH3 + 2H2O → SiO2 + 6NH4F

Reactions with Other Compounds

Ammonium Fluoride and Water

When NH4F reacts via water, it produces hydrofluoric acid and also ammonium hydroxide, as stood for by the complying with equation <2>:

NH4F + H2O → NH4OH + HF

Calcium Nitrate and Ammonium Fluoride

Ammonium fluoride reacts with calcium nitrate to develop calcium fluoride, dinitrogen oxide, and water:

Ca(NO3)2 + 2NH4F → CaF2 + 2N2O + 4H2O

Ammonium Fluoride and Iodine

When ammonium fluoride and also iodine are offered as reactants, they undergo a solitary displacement reaction to create ammonium iodide and fluorine:

NH4F + I2 → NH4I2 + F


Ammonium Fluoride Crystals

Properties and also Characteristics of Ammonium Fluoride

General Properties

Molar Mass/Molecular Weight37.037 g/mol <1>

Physical Properties

Color and also AppearanceWhite or colorless crystalline powder <1>
Melting Point238 °C, 460.4 °F <1>
Boiling PointN/A
Density1.01 g cm-3, 1.32 at 77 °F <1>
pHAqueous NH4F is acidic <1>
State of issue at room temperatureDry powder or liquid <1>
SolubilityInsoluble in liquid NH3, slightly soluble in alcohol <1>
Solubility in Water83.5 g/100 g at 25 °C <1>
Magnetic Susceptibility (χ) -23.0 X 10-6 cm3/mol

Atomic Properties

Crystal StructureHexagonal wurtzite


Ammonium Fluoride Structure


For etching glass, sprucing up metal surencounters, extracting rare metals, and disinfection and also preservation in the unavoidable market <5>As masking agents, preservatives, and also reagents for analysis <5>

Is It Safe

NH4F reasons acute toxicity once it is swallowed, inhaled, or comes in contact with skin <1>. Its inhalation may lead to irritation of the respiratory tract and ingestion of little quantities of soluble fluorides can likewise be fatal <1>. Its contact with skin causes burns, and also exposure through eye contact deserve to irritate the mucous membrane <1>.


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