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- A weak unstable acid, H2CO3, known only in solution, and as carbonate salts; it is present in carbonated drinks, and sparkling wine, but decomposes to form carbon dioxide and water.
- 1898, H.G. Wells, The War of the Worlds, London: William Heinemann, page 144:
- [I]t sank down through the air and poured over the ground in a manner rather liquid than gaseous, abandoning the hills, and streaming into the valleys and ditches and water-courses even as I have heard the carbonic acid gas that pours from volcanic clefts is wont to do.
A weak unstable acid, H2CO3