`-` Acid: 

`+` `HCl`: Hydrochloric acid.

`+` `HNO_3`: Nitric acid.

`+` `H_2SO_4`: Sulfuric acid.

`-` Base:

`+` `NaOH`: Sodium hydroxide.

`+` `Mg(OH)_2`: Magnesium hydroxide.

`-` Oxide acid:

`+` `NO_2`: Nitrogen dioxide.

`+` `P_2O_5`: Diphosphorus pentoxide.

`+` `CO_2`: Carbon dioxide.

`-` Muối:

`+` `FeSO_4`: Iron `(II)` Sulfate.

`+` `Zn(NO_3)_2`: Zinc nitrate.

`@`$hoaibao$