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(C) The quantitative estimation of $O_3$ is performed by passing it through a neutral solution of potassium iodide $(KI)$ buffered with a borate buffe

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Its reaction with $KI$ and titration of $I_2$ liberated with sodium thiosulphate

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(C) The quantitative estimation of $O_3$ is performed by passing it through a neutral solution of potassium iodide $(KI)$ buffered with a borate buffer $(pH = 9.2)$.$O_3$ reacts with $KI$ to liberate $I_2$ according to the reaction: $2I^{-} + H_2O + O_3 	o 2OH^{-} + I_2 + O_2$.The liberated $I_2$ is then titrated against a standard solution of sodium thiosulphate $(Na_2S_2O_3)$ using starch as an indicator: $I_2 + 2Na_2S_2O_3 	o Na_2S_4O_6 + 2NaI$.

The quantitative estimation of $O_3$ is based on

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