• Acids are classified as either strong or weak, based on their ionization in water.
  • A strong acid is an acid which is completely ionized in an aqueous solution.
  • Weak acids are only slightly ionized.
  • An acid ionization constant  is the equilibrium constant for the ionization of an acid.
  • Strong acids are essentially 100% ionized, and so the concentration of the acid in the denominator is nearly zero.
  • For this reason,  values are generally reported for weak acids only.
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