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Created the strongest acid

18.07.2005

At the University of California (USA), with the participation of employees of the Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk), an acid has been created that is a million times stronger than concentrated sulfuric acid. The paradox is that the new acid is not at all aggressive towards materials.

The compound, called carboranoic acid, is the first "super acid" that can be stored in glass bottles. This softness of the new acid is due to its unusually high chemical stability.

Like all acids, the new substance interacts with other compounds, giving them a positively charged hydrogen ion. However, the remaining negatively charged anion is so stable that it does not react further. But it is this secondary reaction that is very significant in corrosion. For example, hydrofluoric acid attacks glass, which is mostly silica, by reacting its negatively charged fluorine ion with silicon and its hydrogen ion with oxygen.

The new acid - its formula H(CHB|1C111) - is an excellent hydrogen ion (proton) donor, which determines the "strength" of the acid. There are much more of these ions in its solution than in sulfuric or nitric acid. However, the carborane part of the acid, which remains after the departure of the hydrogen ion, contains a group of 11 carbon atoms that form the spatial structure of an icosahedron (twenty-sided).

Such a structure is the most stable of the groups of atoms existing in chemistry, which explains the corrosion inertness of the acid.

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