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 ...

Carbonic acid causes the acidity in fizzy drinks. This is used as a test for carbon dioxide. When carbon dioxide is bubbled through limewater the limewater changes from colourless to milky.

Adding alkaline minerals to wastewater may boost its carbon dioxide uptake potential, but scalability remains an issue ...