write balanced equations:

Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium  hydrogen carbonate.

Sodium hydrogen carbonate on reaction with  hydrochloric acid gives sodium chloride, water and liberates Co2.

1) Na2CO3  +  HCl ---> NaCl  + NaHCO3

2) NaHCO3 + HCl --->NaCl + H2O + CO2

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1)  Na2CO3 + 2HCl  ------> NaCl + 2NaHCO3

2) 2NaHCO3 + 2HCl ------> 2NaCl + 2H2O + CO2

Hope this balanced equation helps you!

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