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How is O3 estimated quantitatively? - CBSE (Science) Class 12 - Chemistry

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Question

How is O3 estimated quantitatively?

Solution

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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 NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 7: The p-block Elements
Q: 19 | Page no. 187

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Solution How is O3 estimated quantitatively? Concept: P - Block Group 16 Elements - Ozone.
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