Difference between revisions of "Conjugate base"

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Consider the pair of molecules HX and X<sup></sup>. X<sup></sup> can react to form HX, and vice versa, through an [[acid-base reaction]]. Thus, X<sup></sup> is the conjugate base of HX (and HX is the conjugate acid of X<sup></sup>.)
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When a molecule donates a proton, it is called the '''conjugate base''' of the original molecule. For example, NH<sub>3</sub> is the conjugate base of NH<sub>4</sub><sup>+</sup>. 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]].
  
X<sup>−</sup> acts as a base, with a strength inversely proportional to the strength of its conjugate acid.
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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.
  
 
==See Also==
 
==See Also==

Revision as of 09:43, 3 August 2009

When a molecule donates a proton, it is called the conjugate base of the original molecule. For example, NH3 is the conjugate base of NH4+. NH4+ and NH3 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 NH3 is a weak base, NH4+ is a fairly strong acid.

See Also