Hydrochloric acid, 0.1 N standard solution. Pipette 8.3 mL of concentrated
hydrochloric acid to approximately 500 mL distilled H2O in 1 L volumetric flask soaked in ice
cold water. Allow to cool and make up to volume with distilled H2O. Pour the solution in 1 L
brown bottle and let the solution stand for 2 or 3 days with occasional shaking before
standardisation.