The reaction between Sodium Carbonate and Nitric Acid is a typical acid-base reaction and an acid-base reaction always give salt plus solvent as a final product.
The reaction takes place between a strong acid(HNO3 )and salt of a weak base(Na2CO3) which gives salt (NaNO3 )and a weak acid (H 2CO3)and the weak acid further decompose to give water and carbon dioxide.
HNO3 ----> H+ + NO3-
Na2CO3-----> 2 Na+ + CO3-2
H2CO3-----> H2O+CO2
Therefore the net balanced reaction is
2HNO3 + Na2CO3 ------> CO2 + H2O + 2NaNO3
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