High altitude balloons used by Environment Canada
Question # 00119457
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Updated on: 10/17/2015 07:46 PM Due on: 11/16/2015
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:
O3 (g) + 2I‐ (aq) + 2H+ (aq) I2(aq) + O2(g) + H2O(l)
ozone iodide hydronium ion iodine oxygen gas water
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 x 104 M Na2S2O3 solution to reach equivalence, what is the concentration of ozone in that sample of air (in ppm)?
O3 (g) + 2I‐ (aq) + 2H+ (aq) I2(aq) + O2(g) + H2O(l)
ozone iodide hydronium ion iodine oxygen gas water
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 x 104 M Na2S2O3 solution to reach equivalence, what is the concentration of ozone in that sample of air (in ppm)?
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Solution: High altitude balloons used by Environment Canada