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Preparation and Usage of Hydrofluoric Acid Business Articles | January 14 Cardinals Carson Palmer Jersey , 2012
A highly corrosive acid, Hydrofluoric acid is the inorganic acid of elemental fluorine and is denoted chemically by HF. This fuming, colorless solution is miscible with water, benzene Cardinals Patrick Peterson Jersey , toluene, and concentrated sulfuric acid. A water solution of hydrogen fluoride, hydrofluoric acid contains 35.35% hydrogen fluoride by weight and is known for its ability of dissolving many materials, especially oxides.


?It also exhibits extreme reactivity with glass Cardinals Larry Fitzgerald Jersey , reacting with the silica, SiO2, to form the gas silicon tetra fluoride, SiF4 Cardinals Sam Bradford Jersey , and water; which leaves the surface of the glass etched. Owing to this, it is usually stored in steel tanks, cylinders, or drums Cardinals Chandler Jones Jersey , or, in small amounts, in plastic bottles.

Hydrofluoric Acid is quite possibly the most dangerous chemical to deal with in Power Labs and hence have to be handled with extreme caution. It is a is a severe poison and possesses unique ability to penetrate tissue by non-ionic diffusion. A contact poison, it is known to inflict deep Cardinals David Johnson Jersey , initially painless burns, with later tissue death. Even a 70% spill over 2% body area can prove to be fatal, as the concentrated acid may cause systemic toxicity and eventual cardiac arrest after interfering with the body calcium metabolism. The high concentration acid also out gases pure HF extensively, and inhalation of as much as a single lungful of that gas will result in almost certain death by pulmonary edema.


HF ID identified as:

CAS number (7664-39-3 Yes)
ChemSpider (14214 Yes)
UNII (RGL5YE86CZ Yes)
EC number (231-634-8)
ChEBI (CHEBI:29228 Yes)
RTECS number (MW7875000)

Chemically it can be summarized as:

Molecular formula - HF (aq)

Molar mass? (Not applicable)
Appearance (Colorless solution)
Density (1.15 gmL (for 48% soln.))
Melting point? (?83.37°C)
Boiling point? (19.43°C)
Solubility in water? (Miscible.)
Acidity (pKa) (3.17 )

Preparation

On a commercial level Cardinals Pat Tillman Jersey , Hydrogen fluoride is produced by treating fluorspar (calcium fluoride) with concentrated sulfuric acid. This solution is heated to to a temperature of 256*C and the produced gas is condensed by cooling or dissolved in water. Chemically the reaction can be detailed by the following reaction:

CaF2 + H2SO4 ? 2 HF + CaSO4

Alternatively, a very pure form can also be produced by passing hydrogen fluoride gas through a Teflon filter and freeze it in a Kel. [u