7.19     How is O_{3}  estimated quantitatively?

Answers (1)

A quantitative method for estimating O3 gas is:

When we reacts O_3 with an excess of potassium iodide solution which is buffered with a borate buffer (pH 9.2), iodine is released which can be then titrated against a standard solution of sodium thiosulphate. 

2I^-+H_2O+O_3\rightarrow 2OH^-+I_2+O_2

we use starch as an indicator when  I_2  liberated is titrated against a standard solution of sodium thiosulphate.

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