Common Anions and Cations to Memorize

A set of fill-in-the-blank flashcards covering formulas and traditional names of common anions and cations discussed in Dr. Fry’s CHEM 101 courses.

The ion with formula NO3^- is called _.

nitrate

The formula of nitrite is _.

NO2^-

The ion with formula OH^- is _.

hydroxide

The ion with formula MnO4^- is called _.

permanganate

The acetate ion has the formula _.

C2H3O2^- (or CH3COO^-)

The ion commonly known as bicarbonate has the formula _.

HCO3^-

HSO4^- is called _.

hydrogen sulfate

The ion with formula HSO3^- is _.

hydrogen sulfite

The dihydrogen phosphate ion has the formula _.

H2PO4^-

The ion ClO4^- is called _.

perchlorate

The formula of chlorate is _.

ClO3^-

The ion ClO2^- is called _.

chlorite

The hypochlorite ion has the formula _.

ClO^-

The ion with formula IO3^- is called _.

iodate

The ion IO^- is called _.

hypoiodite

The bromate ion has the formula _.

BrO3^-

The ion BrO^- is called _.

hypobromite

The ion with formula CN^- is _.

cyanide

The formula of cyanate is _.

OCN^-

The ion SCN^- is called _.

thiocyanate

The ion with formula N3^- is _.

azide

The O^2- ion is called _.

oxide

The peroxide ion has the formula _.

O2^2-

The ion with formula S^2- is _.

sulfide

The sulfate ion has the formula _.

SO4^2-

The ion SO3^2- is called _.

sulfite

The thiosulfate ion has the formula _.

S2O3^2-

The ion with formula CO3^2- is _.

carbonate

The formula of chromate is _.

CrO4^2-

The ion Cr2O7^2- is called _.

dichromate

The oxalate ion has the formula _.

C2O4^2-

The ion HPO4^2- is called _.

hydrogen phosphate (monohydrogen phosphate)

The ion with formula P^3- is _.

phosphide

The nitride ion has the formula _.

N^3-

The ion As^3- is called _.

arsenide

The phosphate ion has the formula _.

PO4^3-

The ion PO3^3- is called _.

phosphite

The formula of arsenate is _.

AsO4^3-

The ion AsO3^3- is called _.

arsenite

The ion NH4^+ is called _.

ammonium

The silver ion has the formula _.

Ag^+

The zinc ion has the formula _.

Zn^2+

The cadmium ion has the formula _.

Cd^2+

The aluminum ion has the formula _.

Al^3+

Cu^+ is traditionally called _ ion.

cuprous

Cu^2+ is traditionally called _ ion.

cupric

Fe^2+ is traditionally called _ ion.

ferrous

Fe^3+ is traditionally called _ ion.

ferric

Sn^2+ is traditionally called _ ion.

stannous

Sn^4+ is traditionally called _ ion.

stannic

Pb^2+ is traditionally called _ ion.

plumbous

Pb^4+ is traditionally called _ ion.

plumbic

Hg2^2+ (mercury(I)) is traditionally called _ ion.

mercurous

Hg^2+ (mercury(II)) is traditionally called _ ion.

mercuric

Co^2+ is traditionally called _ ion.

cobaltous

Co^3+ is traditionally called _ ion.

cobaltic