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Question

Hydrogen chloride gas is collected by_______________.


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Solution

Collection of Hydrogen chloride gas:

  • Hydrogen chloride is an acidic, colourless gas that can be easily identified based on its unique odour.
  • The high solubility of hydrochloric acid in water makes it difficult to collect the gas through the downward displacement water technique.
  • The gas is produced by a reaction between sodium chloride and concentrated sulphuric acid and acidic and collected using a technique called downward delivery (Upward displacement of air).
  • The reaction for the above process is given by;

2NaCl(s)Sodiumchloride+conc.H2SO4(l)Sulphuricacid2HCl(g)Hydrochloricacid(fumes)+Na2SO4(s)Sodiumsulphate

  • The less-dense gas expands and moves, the denser air sinks, and this method of gas preparation is called the upward delivery or displacement method.
  • The gas being 1.28 times heavier than air is best collected through this method.

Hence, the Hydrogen chloride gas is collected by upward displacement of air.


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