the reaction is the decomposition of hydrogen peroxide so,
H2O2 + I----> H2O + IO- (slow)
H2O2 + IO- ---> H2O + O2(g) (fast)
The solution is 50 ml of 3% H2O2, 50 ml of .1M KI, and 50 ml of water.
We did this in a lab situation. We reacted these chemicals and placed it in a bottle where the oxygen build-up could expel the solution at a certain rate, thus the 8.42 ml/min is the rate that the solution was expelled with the build up of oxygen.