# Brønsted–Lowry acid–base theory

Chemistry Level pending

In chemistry, the Brønsted–Lowry theory is an acid–base reaction theory, proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in $$1923.$$ The fundamental concept of this theory is that an acid (or Brønsted acid) is defined as being able to lose, or "donate" a proton (the hydrogen cation, or $$\ce{H+}$$) while a base (or Brønsted base) is defined as a species with the ability to gain, or "accept," a proton. The above shows the reaction model where an ammonia $$(\ce{NH3})$$ and a hydrogen chloride $$(\ce{HCl})$$ molecules react to produce an ammonium ion $$(\ce{NH4+})$$ and a chloride ion $$(\ce{Cl-})$$. Which of the following correctly lists all, if any, of the Brønsted acids and Brønsted bases?

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