Question

what happen when hcl is added to sodium hydrogen carbonate how will you test gas form

Answer 1

Metal carbonates are basic substances. So, their reaction with strong mineral acids like hydrochloric acid is often termed as neutralisation reaction.

Both metal carbonates and bicarbonates get readily decomposed by mineral acids with evolution of carbon dioxide (CO2) bubbles.

When hydrochloric acid is added to sodium carbonate, brisk effervescence of CO2 occurs, along with the formation of sodium chloride and water.

CNa2CO3 + 2HCl = 2NaCl + CO2 + H2O

carbon dioxide gas is evolved during this reaction. This gas can be test by passing it through lime wate which turns lime water milky in presence co2