What is hydronium ion and hydroxide ion?

Hydronium ion, H 3 O is what gives a low pH to an aqueous solution. Hydronium ion is made when an acid donates a hydrogen ion to a water molecule Hydroxide ion, OH gives a higher pH to an aqueous solution. Hydroxide ions are found in bases; a base donates hydroxide ions to water Combining H 3 O OH makes 2 H 2 O.In other words, an acid and a base combine to neutralize each other as water.

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