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'''Hydronium''' is a [[Polyatomic Ion|polyatomic ion]]. Its [[chemical formula]] is H<sub>3</sub>O<sup>+</sup>. It is often simplified to H<sup>+</sup> in writing chemical reactions.
'''Hydronium''' is a [[polyatomic ion]] with [[chemical formula]] H<sub>3</sub>O<sup>+</sup>. It is often simplified to H<sup>+</sup> in writing chemical reactions.
Hydronium is present in all aqueous [[solution]]s, as the [[acid]]ic counterpart to the [[alkaline]] [[hydroxide]] (OH<sup>-</sup>). A hydronium ion will combine with a hydroxide ion to create two [[water]] (H<sub>2</sub>O) [[molecule]]s. An imbalance will shift the [[pH]] down if hydronium is more dominant.
Hydronium is present in all aqueous [[solution]]s, as the [[acid]]ic counterpart to the [[alkaline]] [[hydroxide]] (OH<sup>-</sup>). A hydronium ion will combine with a hydroxide ion to create two [[water]] (H<sub>2</sub>O) [[molecule]]s. An imbalance will shift the [[pH]] down if hydronium is more dominant.