The experiments are conducted in a thermostated cell described
else where (Figure 1 in the Supporting Information).
A total of 55 mL of solution A (containing Na2S2O3, KI, KNO3,
and starch) is placed in the cell and 5 mL of solution B
(containing Fe(NO3)3 and HNO3) is placed in the syringe.
Solution A is stirred by a magnet. Solution B is injected into
solution A and a stopwatch is started at that point. Time is
recorded at the moment the solution suddenly turns dark blue.
The experiment is conducted three times for each temperature
and ionic strength.