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Definition
The 5% approximation rule is a guideline used in chemistry to simplify calculations involving weak acids and bases. It states that if the ionization of a weak acid or base is less than 5%, then the concentration of the un-ionized species can be approximated as equal to the initial concentration.
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Related terms
Weak Acid: A weak acid is one that does not completely dissociate into its ions in solution. This means it doesn't release all its hydrogen ions into the solution.
Ionization: Ionization refers to any process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules (ions).
Equilibrium Constant (Ka): Ka is an equilibrium constant specific for reactions involving weak acids in aqueous solutions. It provides information about the degree of ionization for a particular acid.
