The overall reaction of the Winker method for dissolved oxygen (DO) mesaurement is: 2S 2 O 3 2- + 6H + + O 2 S 4 O 6 2- + 3H 2 O. The molecular…

The overall reaction of the Winker method for dissolved oxygen (DO) mesaurement is: 2S2O32-+ 6H++ ½ O2àS4O62-+ 3H2O. The molecular weight of molecular oxygen (O2) is 32 g/mol. The mass of oxygen for every one millimole of Na2S2O3consumed during the titration is: