Question

metal carbonate and hydrogen carbonate salt react with acid because of their weak basic nature they react with acid to form stable salt .But how please explain me

Answer 1

Hey there!

​Acids react with Metal Carbonates and Metal Hydrogen Carbonates (bi-Carbonates) produces Metal salt, Water and Carbon dioxide.

REACTION:- 
For example, 

1) Sodium Carbonate (Na2CO3) reacts with Hydrochloric acid (HCl) to produce Sodium chloride, Water and Carbon dioxide.

2HCl + Na2CO3  ----→  2NaCl + H2O + CO2 ↑

2) Sodium Hydrogen Carbonate (Na2HCO3) reacts with Hydrochloric acid (HCl) to produce Sodium chloride, Water and Carbon dioxide.

2HCl + Na2HCO3  ----→  2NaCl + H2O + CO2 ↑

Hope it helped