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Carbonation. Carbonation occurs when rain, which is naturally slightly acidic due to atmospheric carbon dioxide (CO 2), combines with a calcium carbonate (CaCO 3), such as limestone or chalk. The interaction forms calcium bicarbonate, or Ca (HCO 3) 2.
Chemical Weathering. Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock. Carbonic acid is especially effective at dissolving limestone.
Chemical weathering is the main process that drives the carbonate-silicate geochemical cycle. Figure 2 shows how this cycle controls the long term transformation of silicate rocks into carbonate rocks over geologic time.
Carbonation is the mixing of water with carbon dioxide to make carbonic acid. Carbonation takes place when the rock minerals react with weak carbonic acid formed when water combines with carbon dioxide in the atmosphere.
A chemical reaction occurs between the acidic water and the calcium carbonate and forms calcium bicarbonate. This is soluble and is carried away in solution. Carbonation weathering occurs in warm, wet conditions. Find out more about weathering.
Carbonation weathering occurs when carbon dioxide from the atmosphere mixes with rainwater, creating a weak acid that can dissolve rocks like limestone. This process helps form caves, as water with carbonic acid flows through limestone and creates empty spaces.
The important characteristics of surface conditions that lead to chemical weathering are: the presence of water (in the air and on the ground surface), the abundance of oxygen, and the presence of carbon dioxide, which, when combined with water, produces weak carbonic acid.
The important characteristics of surface conditions that lead to chemical weathering are the presence of water (in the air and on the ground surface), the abundance of oxygen, and the presence of carbon dioxide, which produces weak carbonic acid when combined with water.
Carbonation in chemical weathering is a process where carbon dioxide in the air or water reacts with minerals in rocks, forming carbonates that are more soluble and can be washed away with water, leading to the breakdown of the rock.
4.2.3 Carbonation. Carbonation is perhaps the Earth’s commonest geochemical mechanism and is concerned with the weathering effects of CO 2 in aqueous solution and, particularly, the interaction with CaCO 3 that in some parts may give rise to peculiar karstic landscapes.