Shanghai Xinfan takes you to know about hydrofluoric acid

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Hydrofluoric acid (HF) is an aqueous solution of hydrogen fluoride gas, which is colorless and has a pungent odor. Strongly corrosive. It is obtained by dissolving hydrogen fluoride in water. Hydrofluoric acid plays an important role in the purification of aluminum and uranium. It can also be used to etch glass to remove oxides from the silicon surface, which can be used as a catalyst for the alkylation of isobutane and butane in refineries.

Hydrofluoric acid is an aqueous solution of hydrogen fluoride which is strongly corrosive, and pure hydrogen fluoride is sometimes referred to as anhydrous hydrofluoric acid. Because the ability to combine hydrogen atoms and fluorine atoms is relatively strong, hydrofluoric acid cannot be completely ionized in water, so theoretically low concentration of hydrofluoric acid is a weak acid, but hydrofluoric acid can dissolve many other acids. Dissolved glass (silica). The reaction equation is as follows:

The above reaction is carried out in two steps:

SiF4 is readily soluble in water and continues to react with HF:

Because of this, it must be stored in a plastic container (preferably placed in a Teflon container). If it is to be stored for a long period of time, it is not only necessary to seal the container, but the container should be as vacuum as possible because hydrofluoric acid can dissolve most inorganic oxides.