The reactor was followed by two washing bottles,
each of them containing 500 mL of acidified 2e5% KI solution for
determining unused ozone. The bubble column reactor was filled
The unused ozone was taken out of the bubble column reactor
through the Tygon tubing, and bubbled into 2% KI solution in the
washing bottles, where the potassium iodide solution reacted with
the excess ozone according to the following equation: