ions polyatomiques

Nitrate

$$NO_3^-$$

Ammonium

$$NH_4^+$$

Hydroxyde

$$OH^-$$

Sulfate

$$SO_4^{2-}$$

Phosphate

$$PO_4^{3-}$$

Carbonate

$$CO_3^{2-}$$

Acétate

$$CH_3COO^-$$