Question

Why is brisk effervescence seen when sulphuric acid is added to sodium carbonate?

Answer 1

Brisk effervescence means bubbling.
When sulphuric acid is added to sodium carbonate, the following reaction takes place:

H2SO4 + Na2CO3 ------> Na2SO4 + H2O + CO2

Thus carbon dioxide gas is evolved, which bubbles through Na2SO4 solution, thus brisk effervescence is seen.

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Answer 2

Answer:

Explanation:

When sulphuric acid is added to sodium bicarbonate, the sodium reacts with H2SO4 to release carbon-di-oxide gas and forms sodium sulphate.  

As soon as the acid is added, there will be a period of rapid bubbling. The bubbles are because the carbon-di-oxide gas is escaping, leaving behind aqueas sodium sulphate. The two will neutralize each other and this reaction is called a neutralization reaction.

2NaHCO3(aq)+H2SO4(aq)→Na2SO4(aq)+2CO2(g)+2H2O(l).

Please refer to the attached picture for a balanced equation of this chemical reaction.