How is O_3 estimated quantitatively? - Vidyadip

Question

How is $O_3$ estimated quantitatively?

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Answer

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.
$2\text{I}^-+\text{H}_2\text{O}+\text{O}_3\rightarrow2\text{OH}^-+\text{I}_2+\text{O}_2\\\text{Iodine} \ \ \ \ \ \ \ \ \ \ \text{Ozone} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Iodine}$
$\text{I}_2+2\text{Na}_2\text{S}_2\text{O}_3\rightarrow2\text{Na}_2\text{S}_4\text{O}_6+2\text{NaI}\\ \ \ \ \ \ \ \ \ \text{Sodium} \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Sodium} \\\ \ \ \ \ \ \ \text{thiosulphate} \ \ \ \ \text{tetrathionate}$

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