Kemija - 2009./10. jesen - 15.

${\mathrm{C}\mathrm{a}}^{2+},{\mathrm{H}}_3{\mathrm{O}}^{+},{\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{Ca\}^\{2+\},\; \backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\},\; \backslash mathrm\{OH\}^\{-\}$

${\mathrm{C}\mathrm{a}}^{2-},{\mathrm{H}}_2,{\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{Ca\}^\{2-\},\; \backslash mathrm\{H\}\_\{2\},\; \backslash mathrm\{OH\}^\{-\}$

${\mathrm{C}\mathrm{a}}^{2-},{\mathrm{H}}_3{\mathrm{O}}^{+},{\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{Ca\}^\{2-\},\; \backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{O\}^\{+\},\; \backslash mathrm\{OH\}^\{-\}$

${\mathrm{C}\mathrm{a}}^{2+},{\mathrm{H}}_2,{\mathrm{O}\mathrm{H}}^{-}\backslash mathrm\{Ca\}^\{2+\},\; \backslash mathrm\{H\}\_\{2\},\; \backslash mathrm\{OH\}^\{-\}$