# Tag Info

The pH of ocean water is currently about 8.1, which lies between the second and third dissociation constants (7.20 and 12.37, respectively). So most of the phosphate inthe ocean in its twice-dissociared form, as $\text {HPO}_4^{2-}$. For comparison, our own blood is around pH 7.4, so phosphate in our blood would be a mixture of $\text {HPO}_4^{2-}$ and \$\...