Step-by-step explanation:
Acid reacts with base to form salt and water only
(neutralization reaction)
H2SO4 + 2NaOH –> Na2SO4 + 2H20
Acid reacts with carbonates and hydrogen carbonates to form salt, water and liberate carbon dioxide
4HCl + 2Na2CO3 –> 4NaCl + 2H20 + 2CO2