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Does CO2 (carbon dioxide) dissolve in water?

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Well CO2 dissolves very well in water. Even more than O2. The reason is that CO2 is a non covalent bonded molecule, i.e. it possess polarity. The Oxygen of CO2 molecule forms intermolecular hydrogen bonding with Hydrogen of water molecules. By the word polarity I mean to say that C is slightly positive than O2. read more

Carbon dioxide is soluble in water because water molecules are attracted to these polar areas. The bond between carbon and oxygen is not as polar as the bond between hydrogen and oxygen, but it is polar enough that carbon dioxide can dissolve in water. read more

Aqueous carbon dioxide, CO 2 (aq), reacts with water forming carbonic acid, H 2 CO 3 (aq). Carbonic acid may loose protons to form bicarbonate, HCO 3 - , and carbonate, CO 3 2-. In this case the proton is liberated to the water, decreasing pH. read more

When carbon dioxide dissolves in water it exists in chemical equilibrium with carbonic acid: + ↽ − − ⇀ The hydration equilibrium constant at 25 °C is called K h, which in the case of carbonic acid is [H 2 CO 3]/[CO 2] ≈ 1.7×10 −3 in pure water and ≈ 1.2×10 −3 in seawater. read more

In aqueous solution, carbonic acid exists in equilibrium with carbon dioxide, and the concentration of H 2 CO 3 is much lower than the concentration of CO 2. In many analyses, H 2 CO 3 includes dissolved CO 2 (referred to as CO 2 (aq)), H 2 CO 3 * is used to represent the two species when writing the aqueous chemical equilibrium equation. read more

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