Tableau 1.4: Common Polyatomic Ions

• Tableau 1.4 lists the most common polyatomic ions

Charge 1- Ions

• $NO_2^-$ is nitrite
• $NO_3^-$ is nitrate
• $CN^-$ is cyanide
• $SCN^-$ is thiocyanate
• $OH^-$ is hydroxide
• $ClO^-$ is hypochlorite
• $ClO_2^-$ is chlorite
• $ClO_3^-$ is chlorate
• $ClO_4^-$ is perchlorate
• $CH_3COO^-$ is acetate
• $HS^-$ is hydrogen sulfide

Charge 1- Ions

• $MnO_4^-$ is permanganate
• $HCO_3^-$ is hydrogen carbonate
• $HC_2O_4^-$ is hydrogen oxalate
• $HSO_3^-$ is hydrogen sulfite
• $HSO_4^-$ is hydrogen sulfate
• $HS_2O_3^-$ is hydrogen thiosulfate
• $HCrO_4^-$ is hydrogen chromate
• $HCr_2O_7^-$ is hydrogen dichromate
• $H_2PO_4^-$ is dihydrogen phosphate
• $H_2BO_3^-$ is dihydrogen borate

Charge 2- Ions

• $O_2^{2-}$ is peroxide
• $CO_3^{2-}$ is carbonate
• $C_2O_4^{2-}$ is oxalate
• $SO_3^{2-}$ is sulfite
• $SO_4^{2-}$ is sulfate
• $S_2O_3^{2-}$ is thiosulfate
• $CrO_4^{2-}$ is chromate
• $Cr_2O_7^{2-}$ is dichromate
• $HPO_4^{2-}$ is hydrogen phosphate
• $HBO_3^{2-}$ is hydrogen borate

Charge 1+ Ion

• $NH_4^+$ is ammonium

Charge 3- Ions

• $PO_4^{3-}$ is phosphate
• $BO_3^{3-}$ is borate