Here we can see the ozone discoloring the starch-iodide paper
This is our "reaction vessel". We stopped the ozone generator every 1.0 minute by unplugging the power supply. By then, 3.5 mL O2/O3 had been generated. We vigorously shook the contents to assure all of the ozone had reacted with the PIT (potassium indigo trisulfonate) solution. We know the exact molarity of the PIT solution, but do not know the exact reaction stoichiometry that takes place between PIT and O3.
(Tere page 11) After each 1.0 minute, we measured the absorbance of the solution (and then returned the sample measured back to the reaction vessel). The numerical results are:
...and they plot well. The reaction seemed to
up at the end and eventually the products became yellow. At 11
the solution looked green (Blue+Yellow) and at 12 minutes, it was only
yellow. An even straighter line could be obtained by stopping
We have determined that Pt and Pb give similar results. What point of curiosity is that sometimes her generators make 4 mL/min and sometimes 7 mL per minute.