When heated in the air it is oxidized into columbic acid, and is only soluble in hydrofluoric acid, yielding hydrogen.
This element has a strong affinity for hydrogen, and, therefore, we find it frequently in the form of hydrofluoric acid.
Schwanhart of the process of etching on glass by means of hydrofluoric acid, and the rediscovery by J.
In the "etching" process the surface of the glass is etched by the chemical action of hydrofluoric acid, the parts which are not to be attacked being covered with a resinous paint.
As fluor spar, CaF{2}, and as hydrofluoric acid, HF.
Thus by the action of hydrofluoric acid on manganese peroxide, or by decomposing a solution of hydrofluoric acid by an electric current, either oxygen or a mixture of oxygen and fluorine were obtained instead of fluorine.
For the same reason tin, in acting on hydrochloric acid, evolves hydrogen, and silicon does the same with hydrofluoric acid.
According to Hickling (36) the product of the action of hydrofluoric acid 'has not the remotest resemblance to china clay.
This is a white powder, which is insoluble in acids; even in hydrofluoric acid it is only slightly attacked.
They may be dissolved in hydrofluoric acideither at once or after fusion with bisulphate of potash, and extraction with cold water.
The latest improvement consists in removing the glassy appearance of the surface of the prepared bead by exposure to the fumes of hydrofluoric acid, highly diluted.
It is a non-conductor of electricity, is unaffected by nitric or sulphuric acid, but dissolves readily in hydrofluoric acid, and in a warm solution of caustic potash.
But the two processes can hardly have been combined, and the effect is quite unlike that produced when the surface of glass is eaten away by hydrofluoric acid.
This is by means of hydrofluoric acid, the only re-agent by which glass is rapidly attacked.
By exposing parts of the surface to the fumes of hydrofluoric acid, the only acid that will attack glass.
Hydrofluoric acid, like other strong acids, readily acts on bases and metallic oxides and forms the corresponding fluorides.
Hydrofluoric acid is readily obtained from fluorspar by the action of concentrated sulphuric acid.
The preparation of fluorine was finally accomplished by the French chemist Moissan by the electrolysis of hydrofluoric acid.
A body of glass being formed of layers of different colours, the outer layer or layers are partially removed by eating away by hydrofluoric acid, and the remaining portions are then wrought into designs with the chisel or graver.
The process of etching by hydrofluoric acid, has been largely developed as a means of ornamenting glass, and has to a large extent superseded engraving.
It is used as a source of hydrofluoric acid, which it evolves when heated with sulphuric acid.
Only one compound of hydrogen and fluorine is known, namely hydrofluoric acid, HF or H2F2, which was first obtained by C.
The use of hydrofluoric acid, even in small quantities to prevent fermentation, should not be allowed.
As much as a hundred cubic centimeters of hydrofluoric acid, together with twenty grms.
To remove the last traces of hydrofluoric acid, advantage is taken of the fact that fused sodium fluoride combines with the free acid with great energy to form the double fluoride HF.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "hydrofluoric acid" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
