Hydrofluoric acid
Hydrofluoric acid (HF) is a solution of hydrogen fluoride in water.[2] Its chemical formula is HF. It is a very dangerous acid, being very corrosive and extremely toxic. It can dissolve glass to make hexafluorosilicic acid. If it gets on the skin, it can kill you. It is made by reacting fluorite with sulfuric acid. It is used in the processing of petroleum. It is also used to make various other chemicals containing fluorine, such as teflon (the coating in a frying pan), freon (the cooling agent in an air conditioner), and fluorocarbons (used as propellants in aerosol cans). It is used to clean metals. It is very toxic because it bonds with calcium ions in the body and makes them so they cannot be used. As an acid, it can be deprotonated to produce fluorides, which are also the salts of hydrofluoric acid.
| Hydrofluoric acid | |
|---|---|
| |
| Other names | fluoric acid; fluorhydric acid |
| Identifiers | |
| CAS number | |
| EC number | 231-634-8 |
| RTECS number | MW7875000 |
| SMILES | F |
| Properties | |
| Molecular formula | HF |
| Molar mass | not applicable (see hydrogen fluoride) |
| Appearance | Colorless solution |
| Density | 1.15 g/mL (for 48% soln.) |
| Melting point |
not applicable |
| Boiling point | |
| Solubility in water | Miscible. |
| Acidity (pKa) | 3.15 [1] |
| Hazards | |
| MSDS | duPont MSDS |
| EU classification | Very toxic (T+) Corrosive (C) |
| EU Index | 009-003-00-1 |
| NFPA 704 |
0
4
2
COR
|
| R-phrases | R26/27/28, R35 |
| S-phrases | (S1/2), S7/9, S26, S36/37, S45 |
| Flash point | flammable |
| Related compounds | |
| Other anions | Hydrochloric acid Hydrobromic acid Hydroiodic acid |
| Related compounds | Hydrogen fluoride |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
If someone gets hydrofluoric acid on them, medical attention is needed, as just small amounts are very toxic. (Flesh eater)
Hydrofluoric Acid Media
etching tanks used to perform Piranha, Hydrofluoric acid or RCA clean on 6-inch wafer batches at
A hydrofluoric acid burn of the hand
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Related pages
References
- ↑ Jolly W.L. (1984) Modern Inorganic Chemistry, McGraw-Hill, p.177
- ↑ Ayotte, P; Hébert, M; Marchand, P (Nov 2005). "Why is hydrofluoric acid a weak acid?". J. Chem. Phys. 123 (18): 184501. Bibcode:2005JChPh.123r4501A. doi:10.1063/1.2090259. PMID 16292908.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
Other websites
- International Chemical Safety Card 0283
- National Pollutant Inventory - Fluoride and compounds fact sheet Archived 2006-01-16 at the Wayback Machine
- NIOSH Pocket Guide to Chemical Hazards
- Hydrofluoric Acid Burn, The New England Journal of Medicine Acid burn case study
