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How is O_(3) estimated quantitatively ? |
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Answer» Solution :When `O_(3)` is treated with excess of KI solution BUFFERED with borate buffer, `I_(2)`is liberated quantitatively. `2 I^(-) (aq) + H_(2)O (l) + O_(3)(g) rarr 2 OH^(-) (aq) + I_(2)(s) + O_(2)(g)` The `I_(2)` thus liberated is titrated against a standard solution of sodium thiosulphate using starch as an indicator and the AMOUNT of OZONE can thus be calculated. `UNDERSET("Sod. thiosulphate")(2Na_(2)S_(2)O_(3))+I_(2) rarr underset("Sod. tetrathionate")(Na_(2)S_(4)O_(6))+2 Nal` |
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