Common Polyatomic Ions and Solubility Rules

Vocabulary flashcards covering common polyatomic ions and general solubility rules for aqueous chemistry.

Mercury(I)

A polyatomic cation with the formula $Hg_2^{2+}$.

Ammonium

A polyatomic cation with the formula $NH_4^+$.

Nitrite

A polyatomic anion with the formula $NO_2^-$.

Nitrate

A polyatomic anion with the formula $NO_3^-$.

Sulfite

A polyatomic anion with the formula $SO_3^{2-}$.

Sulfate

A polyatomic anion with the formula $SO_4^{2-}$.

Hydrogen sulfate

A polyatomic anion with the formula $HSO_4^-$ (bisulfate is a widely used common name).

Hydroxide

A polyatomic anion with the formula $OH^-$.

Cyanide

A polyatomic anion with the formula $CN^-$.

Phosphate

A polyatomic anion with the formula $PO_4^{3-}$.

Hydrogen phosphate

A polyatomic anion with the formula $HPO_4^{2-}$.

Dihydrogen phosphate

A polyatomic anion with the formula $H_2PO_4^-$.

Thiocyanate

A polyatomic anion with the formula $NCS^-$ or $SCN^-$.

Carbonate

A polyatomic anion with the formula $CO_3^{2-}$.

Hydrogen carbonate

A polyatomic anion with the formula $HCO_3^-$ (bicarbonate is a widely used common name).

Hypochlorite

A polyatomic anion with the formula $ClO^-$ or $OCl^-$.

Chlorite

A polyatomic anion with the formula $ClO_2^-$.

Chlorate

A polyatomic anion with the formula $ClO_3^-$.

Perchlorate

A polyatomic anion with the formula $ClO_4^-$.

Acetate

A polyatomic anion with the formula $C_2H_3O_2^-$.

Permanganate

A polyatomic anion with the formula $MnO_4^-$.

Dichromate

A polyatomic anion with the formula $Cr_2O_7^{2-}$.

Chromate

A polyatomic anion with the formula $CrO_4^{2-}$.

Peroxide

A polyatomic anion with the formula $O_2^{2-}$.

Oxalate

A polyatomic anion with the formula $C_2O_4^{2-}$.

Thiosulfate

A polyatomic anion with the formula $S_2O_3^{2-}$.