Kemija - 2012./13. ljeto - 28.

${\mathrm{H}}_2\mathrm{S}(\mathrm{a}\mathrm{q})\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{S\}(\backslash mathrm\{aq\})$

${\mathrm{N}\mathrm{H}}_3(\mathrm{a}\mathrm{q})\backslash mathrm\{NH\}\_\{3\}(\backslash mathrm\{aq\})$

$\mathrm{H}\mathrm{B}\mathrm{r}(\mathrm{a}\mathrm{q})\backslash mathrm\{HBr\}(\backslash mathrm\{aq\})$

$\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{N}(\mathrm{a}\mathrm{q})\backslash mathrm\{NaCN\}(\backslash mathrm\{aq\})$