ARIO Rules

Without pKa at hand, we have to have a method for qualitatively assessing an acid's strength. Various aspects of an acid's structure give us some information about acidity.

The key idea is, "It's all about the stability of the conjugate base!"

There are four criteria to consider known as the ARIO rules.

A = Atom

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R = Resonance

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I = Induction

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O = Orbital

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