Molecules to remember :)

Cyanide

CN-

Dihydrogenphosphate

H2PO4-

Ethanoate (acetate)

CH3COO-

Hydrogen Carbonate

HCO3-

Hydrogensulfate

HSO4-

Hydroxide

OH-

Nitrate

NO3-

Permanganate

MnO4-

Nitrite

NO2-

Carbonate

CO3-2

Chromate

CrO4-2

Dichromate

Cr2O7-2

Hydrogen phosphate

HPO4-2

Oxalate

C2O4-2

Oxide

O2-

Sulfate

SO4-2

Sulfite

SO3-2

Phosphate

PO4-3

Ammonium

NH4+

Chromium (|||)

Cr+3

Iron (|||)

Fe+3

Ammonia

NH3

Hydrogen Peroxide

H2O2

Ethanoic acid

CH3COOH

Hydrochloric acid

HCl

Nitric acid

HNO3

Carbonic acid

H2CO3

Sulfuric acid

H2SO4

Sulphurous acid

H2SO3

Phosphoric acid

H3PO4