Question

Estimation of ozone can be made quantitatively by :

• A. Decomposition into O2 and absorption of O2 into pyrogallol
• B. Volumetric method using KI and titration of the liberated iodine using hypo solution
• C. Oxidative ozonolysis method
• D. All methods given above

Answer 1

Answer: (B)

Volumetric method using KI and titration of the liberated iodine using hypo solution

Answer 2

2 KI + H2O + O3 $\longrightarrow$2KOH + O2 + I2

2S2O32– + I2 $\longrightarrow$ S4O62– + 2I–

1 mole of O3 = 1 mole of I2 = 2 mole of S2O32–