User information To test the concentration of the sodium hypochlorite solution, you need the following chemicals for a titration: Acetic acid (Art. No. 6755) Starch solution (Art. No. T133) Potassium iodide (Art. No. 6750) Water, demineralised (Art. No. 3175) Sodium thiosulphate solution 0.1 mol/l (Art. No. K022) Or for a determination by refractive index a corresponding instrument e.g. Art. No. 1PCE.1. The following comparison table can only serve as a guide but cannot replace a titrimetric determination. % Sodium hypochlorite % Brix 15% 32,60% 14% 30,50% 13% 28,70% 12% 27,00% 11% 25,10% 10% 23,20% 9% 21,10% 8% 19,20% 7% 17,30% 6% 13,90% 5% 11,80% 4% 6,90% 3% 4,40% 2% 3,20% 1% 0,70% 0% 0,00% Sodium hypochlorite solution 12 % Cl, stabilised, technical