Sodium Sulfide x-hydrate technical grade

Potassium Hydroxide 0.5 mol/l (0.5N) volumetric solution

Sulfuric Acid 0.01 mol/l (0.02N) (Reag. USP) volumetric solution

Acetic Anhydride (Reag. USP, Ph. Eur.) for analysis, ACS, ISO

Silver Nitrate 1 mol/l (1N) volumetric solution

Potassium Hexacyanoferrate(III) (Reag. USP, Ph. Eur.) for analysis, ACS

Glycolic Acid solution 70 % for synthesis

Buffer Solution pH 12.00 (20C)

Karl Fischer Water Standard 1.0 mg/g (Reag. Ph. Eur.)