Sulphur Dioxide : Preparation , Physical and Chemical property , uses and Storage condition.

 

 Sulphur Dioxide                     [SO₂]

Overview

Sulfur dioxide is a respiratory irritant that is highly soluble in the aqueous surfaces of the respiratory airways. Because of this high solubility, most of the sulfur dioxide is absorbed in the nose and upper airways and very little reaches the lungs directly. Inhalation of high ambient concentrations of sulfur dioxide can cause stimulation of the nerves in the air passages, resulting in a reflex cough, irritation, and chest tightness.

At extremely high concentrations, the death or pathological changes including laryngotracheal and pulmonary edema can be induced in the respiratory tract of experimental animals. The gas is quite corrosive and can also cause damage to buildings and other materials.

It is very acidic


*preparation*


Sulphur dioxide is prepared by the reaction of metallic sulphide or metallic by sulphite with dilute acid.
 or
 Sulphur Dioxide is prepared by the action of dilute sulphuric acid or sulphite.

Na₂SO₃ + H₂SO₄  →  Na₂SO₄ + H₂O + SO₂↑

Physical property

*Sulphur dioxide is a dull gas.

* it has a very pungent smell.

* it is one of the most straight forward gases to melt this is because it consolidates at room temperature under a pressure of 2 ATM.

* it has boiling point 10 degree Celsius.

*It's odour resemble smoulder sulphur.


Chemical property

* it is an acidic oxide  

* it is readily dissolvable in water .

*Sulphur Dioxide breaks up in water and gives out sulfuric acid.

SO₂ + H₂O  →  H₂SO₃

* it reacts vigorously with sodium hydroxide solution and form sodium sulfate.

SO₂ + 2NaOH  → Na₂SO₃ + H₂O

Pharmaceutical Uses 

* in the preparation of sulphuric acid sulphur trioxide and sulfites.

* it is used an antioxidant.

* it is used in laboratory.

* Sulphur Dioxide also used in a disinfectant refrigerant and a reducing agent.

* Sulphur Dioxide also used in a bleach.

 Sulphur dioxide also used in a food preservative specially in dried food.

Storage condition


 it should be kept in well closed container.

Incompatibility

As a strong acid it will react all bases and Alkali  combination of hypo phosphorous acid with oxidizing agent such as nitrate chloride form explosive mixture in concentrated amount.






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