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Strongest acid known?


RyanJ

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  • 2 weeks later...
A superacid is an acid with an acidity greater than that of 100% pure sulfuric acid.

Actually, the fluoroantimonic acid is 2 x 10^19 times stronger than H2SO4! It is the strongest superacid known (therefore the strongest acid), and its aqueous solution is about -25 in pH!

 

HSbF6 decompses with much violence in water, hydrolyzing to HF and antimony oxides.

 

10^19 times stronger just means that the proton is 10^19 less strongly attached to the rest of the molecule. pH relies on concentration of protons (hydronium ions) in water, and will never exceed the -log(conc), where conc is the molarity of the acid in solution multiplied by the number of acidic protons.

 

In water, any acid with a pKa lower than -1.7 is effectively completely dissosciated, forming a "salt" if you will of hydronium ion (analagous to ammonium)

 

How corossive acids are doesn't mean anything with regards to their strength. HSbF6 needs to be handled with all fluoropolymer equipment, simply because the fluoride is immensely corrosive to glass.

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  • 1 year later...

You're both right, but that also means you are both wrong. Water is amphoteric, meaning it can act as an acid or a base. However, its pH and pOH are each 7.00, and are thus far from being the strongest of either. This means it is not the strongest solvent, and there are a great many things, hydrophobic things, that do not dissolve in water.

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