Ammonium hydrogen fluoride
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| Ammonium hydrogen fluoride | |
|---|---|
| Image:Ammonium hydrogen fluoride.jpg | |
| General | |
| Systematic name | Ammonium hydrogen fluoride |
| Other names | Ammonium bifluoride,
Ammonium hydrofluoride, Ammonium acid fluoride |
| Molecular formula | NH4HF2 |
| Empirical formula | NH5F2 |
| SMILES | ? |
| Molar mass | 57.043 g/mol |
| Appearance | white solid |
| CAS number | [1341-49-7] |
| Properties | |
| Density and phase | 1.5 g/cm³, ? |
| Solubility in water | ? g/100 ml (? °C) |
| Melting point | 125 °C (? K) (decomposes) |
| Boiling point | ? °C (? K) |
| Acidity (pKa) | ? |
| Basicity (pKb) | ? |
| Chiral rotation [α]D | ?° |
| Viscosity | ? cP at ? °C |
| Structure | |
| Molecular shape | ? |
| Coordination geometry |
? |
| Crystal structure | ? |
| Dipole moment | ? D |
| Hazards toxic, corrosive, irritant | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | ? °C |
| R/S statement | R: ? S: ? |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Other cations | ? |
| Related ? | ? |
| Related compounds | NH4OH, KHF2 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Ammonium hydrogen fluoride is a compound formed from ammonium fluoride and hydrogen fluoride, with hydrogen fluoride molecules occupying spaces in the crystal lattice similar to hydrated compounds. Thus it could be formulated as NH4F.HF, just like salts with water of crystallization. Ammonium hydrogen fluoride is the major constituent (though sometimes replaced by potassium hydrogen fluoride), in glass-etching fluid. It etches glass due to the fluorination of silicon:
SiO2(s) + 4NH4HF2(aq) →SiF4(l) + 4NH4F(aq) + 2H2O(l)
NH4HF2 contains HF2− ions.
[edit] External links
This can be used to adjust the pH of different solutions to slightly acidic.
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