For estimating ozone in the air, a ceratin volume of air is passed through an acidified or neutral `KI` solution when oxygen is evolved and iodide is oxidised to give iodine. When such a solution is acidified, free iodine is evolved which can be be titrated with standard `Na_(2)S_(2)O_(3)` solution. In an experiment `10` litre of air at1 atm and `27^(@)C` were passed through an alkaline `KI` solution, at the end, the iodine entrapped in a solution on titration as above required `1.5mL` of `0.01N Na_(2) S_(2) O_(3)` solution. Calculate volume `%` fo `O_(3)` in sample.

Answer

`1.847x10^(-3)%`