In chemistry, carbonic acid is an inorganic compound with the chemical formula H₂CO₃. As a dilute solution in water, it is pervasive, but the pure compound, a colorless gas, can only be obtained.
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The carbonic anhydrases (or carbonate dehydratases) form a family of [[enzyme]]s that catalyze the interconversion between [[carbon dioxide]] and [[water]] and the dissociated ions of [[carbonic acid]] (i.e. bicarbonate and hydrogen ions).