Which substance is an Arrhenius base?

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Multiple Choice

Which substance is an Arrhenius base?

Explanation:
An Arrhenius base is a substance that increases the concentration of hydroxide ions (OH−) when dissolved in water. Sodium hydroxide does exactly that: it dissociates in water to yield Na+ and OH−, raising the OH− concentration and making the solution basic. The other substances do not increase OH− in solution—hydroiodic acid and acetic acid donate protons (H+), while water is neutral (though it can act amphoterically, it isn’t considered an Arrhenius base in this context).

An Arrhenius base is a substance that increases the concentration of hydroxide ions (OH−) when dissolved in water. Sodium hydroxide does exactly that: it dissociates in water to yield Na+ and OH−, raising the OH− concentration and making the solution basic. The other substances do not increase OH− in solution—hydroiodic acid and acetic acid donate protons (H+), while water is neutral (though it can act amphoterically, it isn’t considered an Arrhenius base in this context).

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