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Wikipedia definition
1. HydroniumIn chemistry, a hydronium ion is the cation H3O, a type of oxonium ion produced by protonation of water and isoelectronic with ammonia. This cation is often used to represent the nature of the proton in aqueous solution, where the proton is highly solvated (bound to a solvent).
Read “Hydronium” on English Wikipedia
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Read “Hydronium” on DBpedia

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