Hydronium Ion
Chemistry In a Nutshell
When the hydrogen atom loses its electron, only the proton remains. There should be no H+ in water. Hydrogen ion is a small atom with a relatively high positive charge that is irresistibly attractive to water molecules. So, A hydronium ion in solution is surrounded by several molecules of water. For this reason, people write H3O+ (aq), but H9O4 (aq) or even H21O10 (aq) may be more correct.
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Chemistry in a nutshell