(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?
Answers
Answer:
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Explanation:
(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.
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Answer:
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- When ethyne is burnt in air incomplete burning takes place and produce sooty flame due to limited supply oxygen present in the air. ... Hence, This oxy-acetylene flame is used for welding and it is not possible to attain such a high temperature with air. Due this reason a mixture of ethyne and air is not used for welding.
- Acetic acid that contains a very low amount of water (less than 1%) is called anhydrous (water-free) acetic acid or glacial acetic acid. The reason it's called glacial is because it solidifies into solid acetic acid crystals just cooler than room temperature at 16.7 °C, which ice.