At any given pH carbon dioxide and the ions it disassociates into when in water are in equilibrium.

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Carbon dioxide, carbonic acid, bicarbonate, and hydrogen ions are all in equilibrium unless the pH is altered. For example, if acid is added to seawater, reactions which create these ions would shift. This particular case would cause the ions to shift in the first reaction which produces carbonic acid. The excess hydrogen ions would be removed. Information can be found in the section The Ocean's Acid-Base Balance Varies with Dissolved Components and Depth.

At Any Given PH Carbon Dioxide and the Ions It