Polyatomic Ions and Formulas

A complete set of practice question-and-answer flashcards covering standard polyatomic ions and their chemical formulas.

What is the chemical formula for the Acetate ion?

$$C_2H_3O_2^-$$

What is the chemical formula for the Ammonium ion?

$$NH_4^+$$

What is the chemical formula for the Carbonate ion?

$$CO_3^{2-}$$

What is the chemical formula for the Hydrogen Carbonate (bicarbonate) ion?

$$HCO_3^-$$

What is the chemical formula for the Hydroxide ion?

$$OH^-$$

What is the chemical formula for the Nitrate ion?

$$NO_3^-$$

What is the chemical formula for the Nitrite ion?

$$NO_2^-$$

What is the chemical formula for the Chromate ion?

$$CrO_4^{2-}$$

What is the chemical formula for the Dichromate ion?

$$Cr_2O_7^{2-}$$

What is the chemical formula for the Phosphate ion?

$$PO_4^{3-}$$

What is the chemical formula for the Hydrogen Phosphate ion?

$$HPO_4^{2-}$$

What is the chemical formula for the Dihydrogen Phosphate ion?

$$H_2PO_4^-$$

What is the chemical formula for the Hypochlorite ion?

$$ClO^-$$

What is the chemical formula for the Chlorite ion?

$$ClO_2^-$$

What is the chemical formula for the Chlorate ion?

$$ClO_3^-$$

What is the chemical formula for the Perchlorate ion?

$$ClO_4^-$$

What is the chemical formula for the Permanganate ion?

$$MnO_4^-$$

What is the chemical formula for the Sulfate ion?

$$SO_4^{2-}$$

What is the chemical formula for the Hydrogen Sulfate (bisulfate) ion?

$$HSO_4^-$$

What is the chemical formula for the Sulfite ion?

$$SO_3^{2-}$$

What is the chemical formula for the Hydrogen Sulfite (bisulfite) ion?

$$HSO_3^-$$

What is the chemical formula for the Cyanide ion?

$$CN^-$$

What is the chemical formula for the Peroxide ion?

$$O_2^{2-}$$

What is the chemical formula for the Thiocyanate ion?

$$SCN^-$$

What is the chemical formula for the Oxalate ion?

$$C_2O_4^{2-}$$

What is the chemical formula for the Bromate ion?

$$BrO_3^-$$

What is the chemical formula for the Iodate ion?

$$IO_3^-$$