What factors determine acid strength?

1 Answer

Acid strength is determined by the amount of that acid that actually ionizes. Acids are molecular covalent compounds which you don't expect to ionize (release an H+ and leave behind the conjugate base, or Cl for example).

The strongest acids ionize 100%. There are 6 that most consider to be the "STRONG" acids: HCl, HI, HBr, HNO_3,H2SO4 and HClO_4#. These split apart 100%.

All other acids are weak acids and ionize to a much lesser amount. For example, acetic acid, like most weak acids, ionizes, 5%.