Chemistry / Chem 1802 · Atom · ~20 seconds
The Brønsted-Lowry Acid-Base Definition
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The Brønsted-Lowry definition names an acid as a proton donor and a base as a proton acceptor, applying to any reaction, not only water.
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Ammonia accepts a proton from water, NH3 + H2O ⇌ NH4+ + OH−, a Brønsted-Lowry base though it releases no OH− directly.
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Arrhenius classifies only substances acting in water; Brønsted-Lowry classifies the same transfer in any solvent.