How is O3 estimated quantitatively?


One of the quantitative method for estimating O3 gas is when ozone reacts with an excess of potassium iodide solution buffered with a borate buffer (pH 9.2), iodine is liberated. This iodine can be titrated against a standard solution of sodium thiosulphate.


2I(aq) + H2O(l) + O3(g) 2OH(aq) + I2(s) + O2(g)


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