| − | '''Diprotic''' describes an [[acid]] which can donate two [[proton]]s (H<sup>+</sup>) in an acid-base reaction. [[Sulfuric acid]] (H<sub>2</sub>SO<sub>4</sub>) is an example of a common diprotic acid. | + | '''Diprotic''' describes an [[acid]] which can donate two [[proton]]s (H<sup>+</sup>) in an acid-base reaction. [[Sulfuric acid]] (H<sub>2</sub>SO<sub>4</sub>) is an example of a common diprotic acid, although this acid is in itself unusual as it is the only known strong diprotic acid. Carbonic acid, (H<sub>2</sub>CO<sub>3</sub>) is another common diprotic acid that is not strong. A weak acid is any acid that when immersed in water dissociates less than 100%. |