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[mass noun] A very weak acid formed in solution when carbon dioxide dissolves in water.
- ‘This neutralizes carbonic acid and transports carbon dioxide in the blood.’
- ‘Caverns throughout the world are formed by the action of atmospheric carbonic acid (water plus carbon dioxide) on limestone to form the more soluble calcium bicarbonate.’
- ‘Initially, the ammonia and carbon dioxide reacts with water to form the weak electrolytes, ammonium hydroxide and carbonic acid.’
- ‘Finally, if ammonium carbonate is placed in water, the weak base ammonium carbonate and weak acid carbonic acid are produced.’
- ‘In limestone caves, the main source of this acidity is carbon dioxide dissolved to form weak carbonic acid in meteoric waters, although sulphuric acid may be important in thermal waters.’
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