Question
Thu January 26, 2012 By:

Why is it so, if ethyne is burnt for welding purposes with air, instead of Oxygen, it gives incomplete combustion. Explain in detail.

Expert Reply
Thu January 26, 2012
When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion caused by limited supply of air. However, if ethyne is burnt with oxygen, it gives a clean flame with temperature 3000°C because of complete combustion. This oxy-acetylene flame is used for welding. It is not possible to attain such a high temperature without mixing oxygen. This is the reason why a mixture of ethyne and air is not used.
 

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