1.

How is O_3 estimated quantitavely?

Answer»

Solution :Ozone `O_3` reacts with excess of KI solution, buffered with borate buffer `(pH9.2)` to liberate `I_2` QUANTITATIVELY.
`O_(3(g))+2I^(ɵ)+H_2O_(1)to2^(ɵ)OH_(aq)+I_(2(s))+O_(2(g))`
The `I_2` thus liberated is titrated against `Na_2S_2O_3` solution using starch as an INDICATOR,
`2S_2O_3^(2-)toS_4O_6^(2-)+2e^(ɵ)`
`UNDERLINE(I_2+2e^(ɵ)to2I^(ɵ))`
`underline(2S_2O_3^(2-)+I_2toS_4O_6^(2-)+2I^(ɵ))`


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