ions to know

Hydroxide

OH^-

Permanganate

MnO.4^-

Acetate

C.2H.3O.2^-1 or CH.3COO^-1

Nitrate

NO.3^-

Chlorate

ClO.3^1-

Ammonium

NH.4^1+

Sulfate

SO.4^2-

Chromate

CrO.4^-2

Dichromate

Cr.2O.7^2-

Oxalate

C.2O.4^2-

Carbonate

CO.3^2-

Peroxide

O2^-2

Phosphate

PO.4^-3