Carbon dioxide reacts with water to produce carbonic acid. The double arrow means that carbonic acid breaks down pretty readily to form carbon dioxide and water again. A hydrogen atom from the ...

1 We have been able to obtain formaldehyde by the exposure of solutions of carbonic acid and bicarbonates to tropical sunlight in presence of various inorganic and organic photocatalysts.

How can we determine whether carbon dioxide is actually being used or expelled by a plant or an animal? Carbon dioxide dissolves in (and reacts with) water, forming carbonic acid. As this acid forms, ...