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Q. (a) A mixture of ethyne and pure oxygen is used for welding instead of using a mixture of ethyne and air. Why?(b) Why pure acetic acid is called glacial acetic acid?.....?????

Answer»

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  • (a) Ethyne is an unsaturated carbon compound. It burns in air with a sooty flame.

  • It’s an incomplete combustion since the oxygen AVAILABLE from air is not enough to burn the carbon completely.

  • Therefore, for COMPLETE combustion pure oxygen is required, which burns Carbon and Hydrogen completely PRODUCING a very hot and clean flame apt for welding.

  • It is not possible to generate such a high temperature without pure oxygen.

  • b) The Freezing point of pure acetic acid is very high.

  • lt freezes into a solid at a temperature very close to room temperature: 16.5 ºC, or 62 ºF. Hence, during winters it gets FROZEN due to cold climate and appears like an ice.

  • That is why pure acetic acid is called glacial acetic acid.

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