Weak Acid:A weak acid does not completely dissociate in water, meaning it releases only a fraction of its hydrogen ions. Examples include acetic acid (CH3COOH) and carbonic acid (H2CO3).
Partial Ionization: The incomplete separation of an acid into ions when dissolved in water. Nitrous acid partially ionizes, resulting in the formation of H3O+ and NO2- ions.
pH:A measure of the acidity or alkalinity of a solution. Nitrous acid has a lower pH than nitric acid because it produces fewer hydrogen ions when dissolved in water.