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; $\underset{\mathrm{Sodium}\mathrm{chloride}}{2\mathrm{NaCl}\left(\mathrm{s}\right)}+\underset{\mathrm{Sulphuric}\mathrm{acid}}{\mathrm{conc}.{\mathrm{H}}_{2}{\mathrm{SO}}_{4}\left(\mathrm{l}\right)}\to \underset{\mathrm{Hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{g}\right)}\left(\mathrm{fumes}\right)+\underset{\mathrm{Sodium}\mathrm{sulphate}}{{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}\left(\mathrm{s}\right)}$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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