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For general introductory chemistry, the answer is likely proton. The earlier Arrhenius definition characterized an acid as producing hydrogen ions, H+ (actually hydronium, H3O+, positively ionized water) and a base as producing hydroxide ions OH− (negatively ionized water). However, the Brønsted-Lowry acid-base theory defines an acid as a proton donor and a base as a proton acceptor. In more advanced chemical and geochemical definitions, other answers are possible. The Lewis definition says the H+ proton is the acid, and the OH− is the base. In that case an electron pair is being transfered. Geochemists and electrochemists often talk about oxide transfer, that is that oxygen is being accepted and donated.

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15y ago

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