Question

A few drops of Ethanoic acid were added to solid Na2Co3 .What isThe possible result of the reaction ?

Answer 1

Ethanoic acid =Acetic acid 
   2 CH₃COO H (aq) + Na₂ CO₃ (s) ==> 2 CH₃COO Na (s) + H₂ O (l) + CO₂ (g)

Sodium Carbonate is ionic in solution. Acetic acid is a weak acid and dissociates only partially.  The reactions involving Sodium are usually brisk. Gas bubbles come out of solution.   Sodium Acetate salt is soluble in water and is colorless. Carbon dioxide gas  is formed and it bubbles out with effervescence. 

Answer 2

When Ethanoic acid or Ch3Cooh is reacted with Na2Co3 or sodium carbonate then brisk effervescence is produced and Co2 gas is evolved.That is:
2Ch3Cooh + Na2Co3 -» 2Ch3CooNa + Co2 +H2O