Linked from
The 13 pages that link to Hydronium, each with the reason it gives.
pHRelated: In aqueous solutions, hydrogen-ion activity is commonly expressed through hydronium.
NeutralizationRelated: Writing hydronium makes the aqueous proton-transfer reaction explicit.
Weak acidRelated: In water, proton donation by an acid produces hydronium.
Hydrogen halideRelated: Water accepts the proton released as a hydrogen halide ionizes.