Which nature of H₂O is shown by the following reactions respectively?

$\left(\mathrm{I}\right) {\mathrm{H}}_2\mathrm{O}+{\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{OH}}^{-}$

$\left(\mathrm{II}\right) {\mathrm{NH}}_3+{\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{NH}}_4^{+}+{\mathrm{OH}}^{-}$

$\left(\mathrm{III}\right) {\mathrm{H}}_2\mathrm{O}+{\mathrm{H}}_2\mathrm{S}\stackrel{ }{\rightleftharpoons }{\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{HS}}^{-}$

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