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What is the chemical difference between Hydrogen fluoride and hydrofluoric acid?

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Hydrofluoric acid is a solution of hydrogen fluoride in water.

Hydrogen fluoride ionizes in aqueous solution in a similar fashion to other common acids:

HF + H2O → H3O+ + F−
When the concentration of HF approaches 100%, the acidity increases dramatically due to the following equilibrium:

2HF → H+ + FHF−
The FHF− anion is stabilized by the very strong hydrogen - fluorine hydrogen bond. Hydrofluoric acid is the only hydrohalic acid that is not considered a strong acid due to its low degree of ionization in aqueous solution.
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