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

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# Title: Process to Estimate Quantitatively

## Ozone

• 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,