Hydrofluoric acid
From Wikipedia, the free encyclopedia
Hydrofluoric acid is a solution o hydrogen fluoride (HF) in watter. It is a precursor tae awmaist aw fluorine compoonds, includin pharmaceuticals sic as fluoxetine (Prozac), diverse materials sic as PTFE (Teflon), an elemental fluorine itsel. It is a colourless solution that is heichly corrosive, capable o dissolvin mony materials, especially oxides. Its ability tae dissolve gless haes been kent syne the 17t century, even afore Carl Wilhelm Scheele prepared it in lairge quantities in 1771.[2] Acause o its heich reactivity taewart gless an moderate reactivity taewart mony metals, hydrofluoric acid is uisually stored in plastic containers (awtho PTFE is slichtly permeable tae it).[3]
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Names | |||
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Ither names
Fluorhydric acid Hydronium fluoride | |||
Identifiers | |||
CAS Nummer |
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3D model (JSmol) |
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ChEBI | |||
ChemSpider |
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EC Nummer | 231-634-8 | ||
RTECS nummer | MW7875000 | ||
UNII | |||
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SMILES
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Properties | |||
HF | |||
Molar mass | nae applicable (see hydrogen fluoride) | ||
Appearance | Colourless solution | ||
Density | 1.15 g/mL (for 48% soln.) | ||
Meltin pynt | Nae applicable (see hydrogen fluoride) | ||
Bylin pynt | Nae applicable (see hydrogen fluoride) | ||
Solubility in watter |
Miscible. | ||
Acidity (pKa) | 3.17[1] | ||
Hazards | |||
Safety data sheet | duPont MSDS | ||
EU clessification | T+ C | ||
R-phrases | R26/27/28, R35 | ||
S-phrases | (S1/2), S7/9, S26, S36/37, S45 | ||
NFPA 704 |
0
4
0 ACID | ||
Flash pynt | Non-flammable | ||
Relatit compoonds | |||
Ither anions |
Hydrochloric acid Hydrobromic acid Hydroiodic acid | ||
Relatit compoonds |
Hydrogen fluoride | ||
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa). | |||
Y verify (whit is YN ?) | |||
Infobox references | |||
Hydrogen fluoride gas is an acute pushion that mey immediately an permanently damage buffs an the corneas o the een. Aqueous hydrofluoric acid is a contact-pushion wi the potential for deep, ineetially painless burns an ensuin tissue daith. Bi interferin wi bouk calcium metabolism, the concentratit acid mey an aa cause seestemic toxicity an eventual cardiac arrest an fatality, efter contact wi as little as 160 cm2 (25 squerr inches) o skin.