Class 12 Chemistry - Chapter The p-Block Elements NCERT Solutions | How is O3 estimated quantitatively?

Welcome to the NCERT Solutions for Class 12th Chemistry - Chapter The p-Block Elements. This page offers a step-by-step solution to the specific question from Exercise 1, Question 19: how is o3 nbsp estimated quantitatively....
Question 19

How is Oestimated quantitatively?

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.

2I-     +    H2O   +   O3    →   2OH-    +    I2    +   O2

Iodide             Ozone                       Iodine

I2     +   2Na2S2O3         →      Na2S4O6     +     NaI

              Sodium                     Sodium  

           thiosulphate                tetrathionate                 

 

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