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High altitude balloons used by Environment Canada to measure O3 levels in the atmosphere also use a

similar idiometric titration where the iodine liberated is measured by back titration with sodium thiosulfate. In this case the iodine is generated by oxidation of iodide by ozone: If 10,000 L of air were bubbled through an acidic iodide solution (at STP) and was then back titrated with 19.4 mL of a 1.2  104 M Na2S2O3 solution to reach equivalence, what is the concentration of ozone in that sample of air (in ppm)? 



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