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~<h5>Carbonate (CO<sub>3</sub><sup>2–</sup>) is an important ion in chemistry that involves CO<sub>2</sub>. Corals and shelled organisms use insoluble calcium carbonate (CaCO<sub>3</sub>) to form their hard shells. Increasing acidification of the ocean is due to CO<sub>2</sub> being disolved which causes carbonate to be converted to the bicarbonate ion (HCO<sub>3</sub><sup>&#8208;</sup>). </h5>
