carbonic acid(redirected from H2CO3)
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A weak, unstable acid, H2CO3, present in solutions of carbon dioxide in water.
(Elements & Compounds) a weak acid formed when carbon dioxide combines with water: obtained only in aqueous solutions, never in the pure state. Formula: H2CO3
the acid, H2CO3, formed when carbon dioxide dissolves in water, found as its salts and esters, the carbonates.