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How can O_(3) be measured quantitatively? |
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Answer» Solution :When `O_(3)` is allowed to react with KI solution in the presence of BORATE buffer (pH 9.2), `I_(2)` is liberated quantitatively. `2I^(-)(aq)+H_(2)O(l)+O_(3)(g)to2OH^(-)(aq)+I_(2)(s)+O_(2)(g)` The AMOUNT of `O_(3)` can be KNOWN by titrating the liberated iodine with a standard solution of sodium thiosulphate using starch as indicator. `underset("odium thiosulphate")(2Na_(2)S_(2)O_(3))+I_(2)tounderset("sodium tetrathionate")(Na_(2)S_(4)O_(6))+2NaI` |
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