Question

Q. 9. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCI) is
added to test tube A while acetic acid (CH2COOH) is added to test tube B. Amount and
concentration taken for both the acids are same. In which test tube will the fizzing occur more
vigorously and why?​

Answer 1

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In which test tube will the fizzing occur more vigorously and why?

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We know that hydrochloric acid is a strong acid and acetic acid is a weak acid. Being a strong acid, HCl solution contains a much greater amount of hydrogen ions in it. Due to this the fizzing will occur more vigorously in test tube A. The fizzing is due to the evolution of H2 gas which is formed by the action of acid on the magnesium ribbon.

The reaction is as follows :

fast

Mg + 2HCl --------------) MgCl2 + H2

slow

Mg + 2CH3COOH --------------) (CH3COO)2Mg + H2

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Answer 2

Answer:

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Fizzing will occur more vigorously in test tube A. Hydrochloric acid (HCl) is a strong acid whereas acetic acid (CH3COOH) is a weak acid. Being strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test tube A (containing hydrochloric acid). The fizzing is due to the evolution of hydrogen gas which is formed by the action of acid on the magnesium metal of magnesium ribbon.