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General Chemistry Principles, Patterns, and Applications, 2011

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The strongest acids are at the bottom left, <strong>and</strong> the strongest bases are at the top right. The<br />

conjugate base of a strong acid is a very weak base, <strong>and</strong>, conversely, the conjugate acid of a strong<br />

base is a very weak acid.<br />

Acid–Base Equilibrium Constants: K a , K b , pK a , <strong>and</strong> pK b<br />

The magnitude of the equilibrium constant for an ionization reaction can be used to determine the<br />

relative strengths of acids <strong>and</strong> bases. For example, the general equation for the ionization of a weak acid in<br />

water, where HA is the parent acid <strong>and</strong> A − is its conjugate base, is as follows:<br />

Equation 16.14<br />

( ) + H2O( l) H 3O + ( aq) + A - ( aq)<br />

HA aq<br />

The equilibrium constant for this dissociation is as follows:<br />

Equation 16.15<br />

K = [H3O+][A-][H2O][HA]<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

1445

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