Hydronium
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Hydronium is a common Polyatomic Ion. Its chemical formula is <math>H_3O^+</math>.
Hydronium is present in all aqueous solutions, as the acidic counterpart to the alkaline hydroxide (<math>OH^-</math>). A hydronium ion will combine with a hydroxide ion to create two water (<math>H_2O</math>) molecules. An imbalance will shift the pH down if hydronium is more dominant.