Gthich giúp em với ạ

`a)`

`Na_2CO_3->2Na^{+}+CO_3^{2-}`

`CO_3^{2-}+H_2O`  $\rightleftharpoons$  `HCO_3^{-}+OH^-`

`->` Môi trường base.

`b)`

`KHCO_3->K^{+}+HCO_3^-`

`HCO_3^{-}+H_2O`  $\rightleftharpoons$  `CO_3^{2-}+H_3O^+`

`HCO_3^{-}+H_2O`  $\rightleftharpoons$  `H_2CO_3+OH^{-}`

`->` Môi trường base.

`c)`

`NH_4Cl->NH_4^{+}+Cl^-`

`NH_4^{+}+H_2O`  $\rightleftharpoons$  `NH_3+H_3O^+`

`->` Môi trường acid.

`d)`

`AlCl_3->Al^{3+}+3Cl^-`

`Al^{3+}+3H_2O`  $\rightleftharpoons$  `Al(OH)_3+3H^+`

`->` Môi trường acid.

`e)`

`Fe_2(SO_4)_3->2Fe^{3+}+3SO_4^{2-}`

`Fe^{3+}+3H_2O`  $\rightleftharpoons$  `Fe(OH)_3+3H^+`

`->` Môi trường acid.

`f)`

`CH_3COONa->CH_3COO^{-}+Na^+`

`CH_3COO^{-}+H_2O`  $\rightleftharpoons$  `CH_3COOH+OH^-`

`->` Môi trường base.