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'''Orthocarbonic acid''' is the hypothetical [[acid]] with the [[chemical formula]] H<sub>4</sub>CO<sub>4</sub>. In this molecule, a single carbon atom is bonded to four [[hydroxyl]] groups. This compound is hypothetical because not even one molecule of this acid has ever been shown to exist. This is because it is highly unstable, decomposing into [[carbon dioxide]] and [[water]]. This acid is tetraprotic (has four dissociable [[protons]]), and thus could form four types of salts, as demonstrated by the series NaH<sub>3</sub>CO<sub>4</sub>, Na<sub>2</sub>H<sub>2</sub>CO<sub>4</sub>, Na<sub>3</sub>HCO<sub>4</sub>, and Na<sub>4</sub>CO<sub>4</sub>. The analogous [[orthosilicic acid]] is well known. Other examples of hypothetical compounds so unstable as not to have been shown to exist are [[ammonium]] [[nitride]], (NH<sub>4</sub>)<sub>3</sub>N, and [[bromine]] [[hepta]]-[[fluoride]], BrF<sub>7</sub>.
[[Category:Acids]]
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