Process to Estimate Quantitatively: Ozone: Estimate Quantitatively (For CBSE, ICSE, IAS, NET, NRA 2022)

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Title: Process to Estimate Quantitatively


Ozone or Trioxygen
  • Ozone, or trioxygen, is an inorganic molecule with the chemical formula .
  • It is a pale blue gas with a distinctively pungent smell.
  • It is an allotrope of oxygen that is much less stable than the diatomic allotrope , breaking down in the lower atmosphere to
  • Ozone is thermodynamically unstable; this is because oxygen decomposes in Ozone and then the Heat is liberated.
  • Adding to this, Ozone is known to consist of 3 molecules of oxygen and is in an unstable state and is known to give out one molecule of oxygen for restoring a diatomic state.
  • Being endothermic compound readily decomposes on heating to give dioxygen nascent oxygen.
  • Since nascent oxygen is very reactive, therefore, O3 acts as a powerful oxidizing agent.
  • Formula:
  • Molar mass:
  • IUPAC ID: Trioxygen
  • Density:
  • Boiling point:-112 °C
  • Soluble in: Water, Sulfuric acid, Carbon tetrachloride

Estimate Quantitatively

  • Ozone is estimated with the help of potassium iodide, when ozone and potassium iodide react, iodine is liberated.
  • Quantitatively, ozone can be estimated with the help of potassium iodide. When ozone is made to react with potassium iodide solution buffered with a borate buffer (pH 9.2) , iodine is liberated.
  • The iodine obtained is the treated against a standard solution of sodium thiosulphate using starch as an indicator
  • This liberated iodine can be titrated against a standard solution of sodium thiosulphate using starch as an indicator.

The reactions involved in the process,

Illustration 2 for Estimate_O3_Quantitatively