THE USES OF SULFUR COMPOUNDS

    Sulfur dioxide is an important compound in its own right. It is used in the manufacture of paper. When made from wood pulp or from other materials, the paper is usually pale yellow in colour. Sulfur dioxide is used to bleach it to the white colour which is needed. Sulfur dioxide is a preference for chloride as it is less harmful to the environment. 

    Sulfur dioxide is also used in the food industry. It is used to kill bacteria in food to prevent the "going bad". Examples of foods where it is used include dried apricots and wine. 

    When concentrated, sulfuric acid is very dangerous. It is a powerful dehydrating agent and oxidising agent and can cause very severe burns.

     The dehydrating properties of the concentrated acid can be demonstrated in the laboratory by its reaction with sugar (sucrose). Sugar is a carbohydrate - it contains carbon, hydrogen and oxygen. The concentrated removes the hydrogen and oxygen in water, leaving carbon behind.

                            conce.H2SO4

sugar (sucrose)          ⟶             carbon

                            (- water )


                         conce.H2SO4

C12H22O11.                        ⟶              12C

                         ( - 11H2O ) 

     The acid will dehydrate other carbohydrate materials, such as paper, clothing and wood, in a similar way. 

     When dilute, sulfuric acid is safer, but it is still a strong acid with normal acid properties. 

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