Calcium carbonate (CaCO3) ... and carbonate ion (CO 2 3). From a purely chemical point of view, calcium reacts with inorganic carbon as: Ca2++CO2 3!CaCO3 (1) Precipitation is thermodynamically favored when [Ca2+] and [CO2 3] reach or exceed 5 the solubility of CaCO3 in seawater. The stoichiometric solubility product is defined as: K sp =[Ca 2+] saturated[CO 2 3]saturated (2) and is a .
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