Paragraph 3 REAGENTS

Distilled or demineralised water, free from chloride ions.

3.1

Acetone AR.

3.2

Concentrated nitric acid (density at 20°C ρ = 1.40 g/ml).

3.3

Silver nitrate 0.1 M standard solution. Store this solution in a brown glass bottle.

3.4

Silver nitrate 0.004 M standard solution — prepare this solution at the time of use.

3.5

Potassium chloride 0.1 M standard reference solution. Weigh, to the nearest 0.1 mg, 3.7276 grams of analytical-grade potassium chloride, previously dried for one hour in an oven at 130°C and cooled in a desiccator to ambient temperature. Dissolve in a little water, transfer the solution without loss into a 500 ml standard flask, dilute to the mark and mix.

3.6

Potassium chloride 0.004 M standard reference solution — prepare this solution at the time of use.