How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?


When Hydrochloric acid reacts with an active metal (like zinc), it is observed that gas-filled bubbles are formed on the surface of the metal.

Test for hydrogen: On passing this gas through soap solution and bringing it near a burning candle. If the gas present in the bubble burns with a 'pop' sound, then it's hydrogen gas.

 $Zn\ ( s) \ +\ 2HCl\ ( aq) \ \rightarrow \ ZnCl_{2} \ ( aq) \ +\ H_{2} \ ( g)$

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Updated on: 10-Oct-2022

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