explain why carbon dioxide and water are produced when a metal carbonate reacts with an acid
Answers
When an Acid reacts with a carbonate and or bicarbonate, caborn dioxide (CO2) is liberated and when it reacts with a metal (active metal) Hydrogen gas (H2) is liberated.
HCl + Na2CO3 → NaCl + CO2(g)+ H2O
HCl + Na → NaCl + H2(g)
when carbonate reacts with acid , it forms corresponding salt, CO2 & H2O.
Na2CO3 (s) + 2HCl ——→ 2NaCl (sq) + H20(l) + CO2 (g)
Sodium carbonate ( Metal carbonate) reacts with hydrochloric acid, it forms sodium chloride salt , carbon dioxide & water.
Metal carbonate + acid -> salt + carbon dioxide + water
The salt consists of the metal cation and the anionic form of the acid (e.g. chloride ion from HCl)
Observations:
The metal carbonate dissolves. If the salt formed is water-soluble, the colourless solution turns to the colour of the metal ion(aq). Otherwise, a precipitate having the colour of the metal ion(s) is seen.
Colourless gas bubbles are evolved. The gas formed turns limewater milky.