Kemija - 2020. jesen, 29.

${\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{OH\}^\{-\}$  i  ${\mathrm{H}}_2\mathrm{O}\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{O\}$

${\mathrm{H}\mathrm{C}\mathrm{O}}_3^{-}\backslash mathrm\{HCO\}\_\{3\}^\{-\}$  i  ${\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{OH\}^\{-\}$

${\mathrm{H}}_2\mathrm{O}\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{O\}$ i ${\mathrm{H}}_2{\mathrm{C}\mathrm{O}}_3\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{CO\}\_\{3\}$

${\mathrm{H}}_2{\mathrm{C}\mathrm{O}}_3\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{CO\}\_\{3\}$ i ${\mathrm{H}\mathrm{C}\mathrm{O}}_3{}^{-}\backslash mathrm\{HCO\}\_\{3\}\{\; \}^\{-\}$