Question

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 1

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$\huge \red {\mathbb {ANSWER}}$

• (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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Answer 2

(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. It 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.