[Dubs]

My college book states,
"Arrhenius-Acids-"a substance that produces hydrogen ions"
"Arrhenius- Bases- "a substance that produces hydroxide ions"
"B-L- Acids- "A Proton donor"
"B-L - Bases-" A Proton receiver"

I know most things dissolve in H20. However, my teacher says H2O cannot be added into a formula to determine acids or bases because of H20 being a carrier instead of a reactant. Having see that most acids and bases have hydrogen or hydroxide components, can O or O2 be an acid or base? Im having trouble finding an element that can be categorized by the B.L. method as an acid, but not by the Arrhenius. Would O or O2 be one?

[Borek]

Don't look for elements. Think in terms of ammonia - it doesn't contain oxygen, yet when added to water it produces OH^-. I am not sure what your prof means, water plays important role here.

[AWK]

Water is not a reactant in Arrhenius theory only.
Arrhenius theory needs acid is a neutral molecule whereus in BL theory ions are also the acids, eg NH₄⁺

[Dubs]

Thank you for your help.