Question

what happens when an acid reacts with metal carbonate or metal hydrogen carbonate? give one example​

Answer 1

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

For example,

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

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

Answer 2

Explanation:

When acids react with carbonates, such as calcium carbonate (found in chalk, limestone and marble), a salt, water and carbon dioxide are made.

acid + metal carbonate → salt + water + carbon dioxide

sulfuric acid + iron(II) carbonate → iron(II) sulfate + water + carbon dioxide

H2SO4 + FeCO3 → FeSO4 + H2O + CO2

The carbon dioxide causes bubbling during the reaction, which is observed as fizzing. It can be detected by passing the gas through limewater, which will go cloudy.

Also, the reaction of metal carbonates with acids is exothermic (ie heat energy is given out).

This type of reaction can be used to test unknown solutions to see if they are acidic. Simply add a solution of sodium carbonate to the solution and if carbon dioxide gas is given off, the solution is acidic.

This type of reaction can also be used to test unknown solutions for the presence of carbonate (CO3–) ions. Simply add an acid to the solution and if bubbles of carbon dioxide are given off, the solution contains carbonate ions.