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Hydrogen may be prepared in the laborato...

Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?

Text Solution

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To collect dry hydrogen, the apparatus has to be modified by passing the pure gas through a U-shaped drying tube, filled with a drying agent (usually an anhydrous salt) to remove water vapour.
The drying agent used for this purpose is Calcium Chloride `(CaCl_2)` or Sodium sulphate `(Na_2SO_4)` or phosphorous pentoxide .
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