hydrofluoric acid


  • WordNet 3.6
    • n hydrofluoric acid a weak poisonous liquid acid; formed by solution of hydrogen fluoride in water
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Webster's Revised Unabridged Dictionary
    • Hydrofluoric acid (Chem) a colorless, mobile, volatile liquid, HF, very corrosive in its action, and having a strong, pungent, suffocating odor. It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.
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In literature:

Hydrofluoric acid, not electrolysable, 770.
"Experimental Researches in Electricity, Volume 1" by Michael Faraday
The use of hydrofluoric acid, even in small quantities to prevent fermentation, should not be allowed.
"Scientific American Supplement, No. 832, December 12, 1891" by Various
When heated in the air it is oxidized into columbic acid, and is only soluble in hydrofluoric acid, yielding hydrogen.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
With absolutely anhydrous hydrofluoric acid the current will no longer pass.
"Scientific American Supplement, No. 561, October 2, 1886" by Various
Second, hydrofluoric acid will bite its way through glass.
"The Summons" by A.E.W. Mason
It smells somewhat like hypochlorous acid, etches dry glass, and decomposes water, liberating ozone, and forming hydrofluoric acid.
"Scientific American Supplement, No. 633, February 18, 1888" by Various
Hydrofluoric acid is readily obtained from fluorspar by the action of concentrated sulphuric acid.
"An Elementary Study of Chemistry" by William McPherson
For deep etching, hydrofluoric acid is diluted with 11/2 vols.
"Scientific American Supplement, No. 1157, March 5, 1898" by Various
Hydrofluoric acid will not affect a pure diamond, but will dissolve all imitations.
"Practical Mechanics for Boys" by J. S. Zerbe
The emery and excess of hydrofluoric acid may then be thrown into a large beaker of clean water and washed several times.
"On Laboratory Arts" by Richard Threlfall
The fluoride, CrF3, results on passing hydrofluoric acid over the heated chloride, and sublimes in needles.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3" by Various
Cupric fluoride, CuF2, is obtained by dissolving cupric oxide in hydrofluoric acid.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3" by Various
Hydrofluoric acid is evolved, and the red color of the paper is changed into a straw-yellow.
"The Elements of Blowpipe Analysis" by Frederick Hutton Getman
It is used as a source of hydrofluoric acid, which it evolves when heated with sulphuric acid.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5" by Various
With ordinary dry-plates the method usually recommended is to immerse them in dilute hydrofluoric acid.
"Photogravure" by Henry R. Blaney
Hydrofluoric acid should be used with great care.
"Scientific American, Vol. XXXIX.--No. 24. [New Series.], December 14, 1878" by Various
The surface of the glass had usually been treated with hydrofluoric acid so as to have a satin-like gloss.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1" by Various
If possible try fumes of hydrofluoric acid.
"Health, Happiness, and Longevity" by Louis Philippe McCarty
Take a portrait negative that is no longer of any use, and immerse it in a weak solution of hydrofluoric acid.
"Photographic Amusements, Ninth Edition" by Walter E. Woodbury and Frank R. Fraprie
The residue now remaining was filtered and after ignition was treated with hydrofluoric and sulphuric acids.
"Barium, A Cause of the Loco-Weed Disease" by Albert Cornelius Crawford

In news:

Acid Etching This process for the decoration of glass involves the application of hydrofluoric acid to the glass surface.
Hydrofluoric acid or a similar chemical may be used to give glass a matte, frosted appearance (similar to that obtained by surface sandblasting).
Firefighters on Monday morning found two workers injured when a sight glass on a pump unit ruptured , exposing them to a mixture of propane and hydrofluoric acid, said Memphis Fire Department spokesman Wayne Cooke.
Memphis Fire Department spokesman Wayne Cooke says the workers were exposed to a mixture of propane and hydrofluoric acid when a sight glass on a pump unit ruptured .

In science:

Finally, isotropic wet-etching with 1% hydrofluoric acid selectively removes the 400 nm thick sacrificial layer in the vicinity of the already etched trenches.
Laterally defined freely suspended quantum dots in GaAs/AlGaAs heterostructures