Answer:
Estimation of O3
is done by treating it with excess of KI solution buffered with borate buffer
(pH 9.2) when I2 is liberated quantitatively.
2l? (aq) + H2O (l) +
O3 (g) 
2OH?
(aq) + I2 (s) + O2(g)
The I2
thus liberated is titrated against a standard solution of sodium thiosulphate
using starch as indicator.
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