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How is 'O3' estimated quantitatively?...

How is 'O_3' estimated quantitatively?

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When ozone reacts. with an excess of potassíum iodide solution as .2 Iaq+H_2 Ol+O_3~g rarr 2 O H^-aq+I_2^2~s+O_2~g. ]._2. iș liberated which can be titrated against a-standard .solution- of sodiuim thiosulphate .Na, S_2 Q_3. . It is a quantitative method of estimating the .O_3. gas:
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