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The hypothetical compound C(OH)₄ (orthocarbonic acid or methanetetrol) is unstable in aqueous solution:

:C(OH)₄ -> + H₃O⁺
: + H⁺ H₂CO₃It has only been produced in the laboratory from carbon dioxide and water under extreme low temperatures and pressures with high-energy irradiation.

Carbon dioxide is also known as carbonic

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