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The p-Block Elements
When ozone reacts with an excess of potassium iodide. Solution buffered with a borate buffer (pH = 9.2).
2I-(aq) +H2O(l) +O3(g) → 2OH-(aq) +I2(s) +H2O(g)
Iodine is liberated which can be titrated against a standard solution of sodium thiosulphate. This is a quantitative method of estimating the O3 gas.
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