Kemija - 2018. jesen, 20.

${\mathrm{C}\mathrm{l}}^{-}\backslash mathrm\{Cl\}^\{-\}$

${\mathrm{H}\mathrm{S}\mathrm{O}}_4{}^{-}\backslash mathrm\{HSO\}\_\{4\}\{\; \}^\{-\}$

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

${\mathrm{C}\mathrm{H}}_3{\mathrm{C}\mathrm{O}\mathrm{O}}^{-}\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{COO\}^\{-\}$