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When a base receives a proton, it is called the '''conjugate acid''' of that base. For example, NH<sub>4</sub><sup>+</sup> is the conjugate acid of NH<sub>3</sub>. NH<sub>4</sub><sup>+</sup> and NH<sub>3</sub> are a conjugate acid-base pair. One can be transformed into the other by undergoing a simple [[acid-base reaction]].
When a molecule receives a proton, it is called the '''conjugate acid''' of the original molecule. For example, NH<sub>4</sub><sup>+</sup> is the conjugate acid of NH<sub>3</sub>. NH<sub>4</sub><sup>+</sup> and NH<sub>3</sub> are a conjugate acid-base pair. One can be transformed into the other by undergoing a simple [[acid-base reaction]].
The conjugate acid acts as an acid, with a strength inversely proportional to the strength of its conjugate base. For example, since NH<sub>3</sub> is a weak base, NH<sub>4</sub><sup>+</sup> is a fairly strong acid.
The conjugate acid acts as an acid, with a strength inversely proportional to the strength of its conjugate base. For example, since NH<sub>3</sub> is a weak base, NH<sub>4</sub><sup>+</sup> is a fairly strong acid.