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<p>most common are the <a href="page.php?w=carbonate">carbonate</a> (CO<sub>3</sub><sup>2-</sup>) and <a href="page.php?w=oxalate">oxalate</a> (C<sub>2</sub>O<sub>4</sub><sup>2-</sup>).  The corresponding acids are the highly unstable <a href="page.php?w=carbonic_acid">carbonic acid</a> (H<sub>2</sub>CO<sub>3</sub>) and the quite stable <a href="page.php?w=oxalic_acid">oxalic acid</a> (H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>), respectively.  These anions can be partially deprotonated to give the <a href="page.php?w=bicarbonate">bicarbonate</a> (HCO<sub>3</sub><sup>-</sup>)</p><p>
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