Conjugate acid-base pairs | Chemical reactions | AP Chemistry | Khan Academy

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In the Brønsted-Lowry definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺). A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid. View more lessons or practice this subject at www.khanacademy.org/science/a...
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I thought protons remain in the nucleus?

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in my textbook it says: HCl, H2O is not a base pair?
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Wait I thought elements can lose electrons but not protons???

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The H+ ion is the proton in this case......

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