How is O3 estimated quantitatively?
Quantitatively, ozone can be estimated with the help of potassium iodide. When ozone is made to react with potassium iodide solution buffered with a borate buffer (pH 9.2), iodine is liberated. This liberated iodine can be titrated against a standard solution of sodium thiosulphate using starch as an indicator. The reactions involved in the process are given below.
`2I^(-) + H_2O + O_3 -> 2OH^(-) + I_2 + O_2`
Iodide Ozone Iodine
`I_2 + 2Na_2S_2O_3 -> Na_2S_4O_6 + 2 Nal`
Sodium thiosulphate Sodium tetrathionate
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