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Brønsted–Lowry acid–base theory
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<p>The Brønsted–Lowry theory (also called proton theory of acids and bases) is an <a href="/facts/Acid%25E2%2580%2593base_reaction/z8pbL0X8">acid–base reaction</a> theory which was developed independently in 1923 by physical chemists <a href="/facts/Johannes_Nicolaus_Br%25C3%25B8nsted/pw6sL4oc">Johannes Nicolaus Brønsted</a> (in Denmark) and <a href="/facts/Thomas_Martin_Lowry/XxL9Ftxo">Thomas Martin Lowry</a> (in the United Kingdom). The basic concept of this theory is that when an acid and a base react with each other, the acid forms its <a href="/facts/Conjugate_acid/hohgQ07M">conjugate base</a>, and the base forms its <a href="/facts/Conjugate_acid/hohgQ07M">conjugate acid</a> by exchange of a <a href="/facts/Proton/clCjepXP">proton</a> (the hydrogen cation, or H+). This theory generalises the <a href="/facts/Arrhenius_theory/z8pbL0X8">Arrhenius theory</a>. </p>