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Chemistry
What ion is most closely associated with bases?

ammonium
hydroxide
carbonate
hydrogen
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Answer is: hydroxide.

According to  Bronsted-Lowry theory acid are donor of protons and bases are acceptors of protons (the hydrogen cation or H⁺).  

The hydroxide anion (OH⁻) is Bronsted base and it can accept proton and become conjugate acid H₂O.

Balance chemical reaction with acid:  

OH⁻(aq) + H⁺(aq) ⇄ H₂O(l).

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