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How is O(3) estimated quantitatively ?...

How is `O_(3)` estimated quantitatively ?

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`O_(3)` reacts with an excess of KI solution buffered with a borate buffer, I2 is liberated which is titrated against standard solution of sodium thiosulphate.
`2I^(-)(aq)+H_(2)O(l)+O_(2)(g)rarrI_(2)(s)+O_(2)(g)+2OH^(-)(aq)`
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