Question

A pinch solid sodium carbonate is added into dilute hydrochloric acid in a testube. sodium chloride and water formed remain the solution whereas carbondioxide escape out. The tube is found to become hot. How will the reaction represented to make max. Informative

Answer 1

To make it more better and informative, you can add :-
On adding a pinch of sodium carbonate is added into dilute hydrochloric acid in a test tube, strong effervescence is observed.
Reason:-Evolution of carbon dioxide.
Reaction:-Na2co3 + 2HCl  ->  2NaCl + H2O + CO2
Hope it helps!

Answer 2

Answer:

For making it more informative you can write it as this way -

Na2Co3(s) + 2HCL(l) = 2NaCl(s) + H2O (l)+ CO2(g) + Heat

Hope it's helpful!