Define an acid?

Answers (2)

a substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind.
"trees were exposed to mixtures of heavy metals, acids, and overdoses of nutrients"

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There are three definitions of acid that are used all the time, and everybody will assume that you know them perfectly. So get into the book and learn them.
en.wikipedia.org/wiki/Br%C3%B8nsted%E2%80%93Lowry_acid%E2%80%93base_theory
en.wikipedia.org/wiki/Lewis_acids_and_bases
en.wikipedia.org/wiki/Acid-base_reaction#Arrhenius_theory

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