The amount of ozone, O 3 , in a mixture of gases can be determined by passing

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The amount of ozone, O3, in a mixture of gases can be determined by passing the mixture through a solution of excess potassium iodide, KI. Ozone reacts with the iodide ion as follows:

O3(g) + 3(aq) + HO(1) O2(g) + 13 (aq) + 2OH(aq)

The amount of I3- produced is determined by titrating with thiosulfate ion, S2O32-:

13 (aq) + 2SO3(aq)  31 (aq) +S406- (aq)

A mixture of gases occupies a volume of 53.2 L at 18 °C and 0.993 atm. The mixture is passed slowly through a solution containing an excess of KI to ensure that all the ozone reacts. The resulting solution requires 26.2 mL of 0.1359 M Na2S2O3 to titrate to the end point. Calculate the mole fraction of ozone in the original mixture.

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General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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