carbon dioxide
When hydrochloric acid and magnesium carbonate react, they produce magnesium chloride, carbon dioxide, and water. The balanced chemical equation for this reaction is: 2HCl + MgCO3 → MgCl2 + CO2 + H2O.
Magnesium Carbonate
When dilute hydrochloric acid is poured on magnesite, carbon dioxide gas is produced. Magnesite is a mineral composed of magnesium carbonate, and when it reacts with hydrochloric acid, it forms magnesium chloride, water, and carbon dioxide gas.
Magnesium chloride is formed.
Hydrochloric acid gives off hydrogen gas when it reacts with certain metals, such as magnesium or zinc. When hydrochloric acid reacts with limestone (calcium carbonate), carbon dioxide gas is produced.
Magnesium Carbonate + Hydrochloric Acid ------> Magnesium Chloride + Water + Carbon Dioxide The previous answer said magnesium hydroxide + carbon dioxide, but then you will have canceled out the chlorine, which due to the law of conservation of mass, is impossible.
Magnesium Chloride. MgCO3 +2HCl -----> MgCl2 + CO2 + H2O
The balanced chemical equation for the reaction between magnesium carbonate (MgCO3) and hydrochloric acid (HCl) is: MgCO3 + 2HCl -> MgCl2 + H2O + CO2
Carbon Dioxide
When magnesium carbonate is added to hydrochloric acid, a chemical reaction occurs that produces magnesium chloride, water, and carbon dioxide gas. The fizzing you see is the carbon dioxide gas being released. Once all the carbon dioxide has been produced and released, the fizzing stops.
The products that are formed will be magnesium salt, water and carbon dioxide. Exactly what salt is made depends the acid used. Hydrochloric acid produces magnesium chloride; sulphuric acid produces magnesium sulphate; nitric acid produces magnesium nitrate.
Carbon dioxide gas is produced when any strong acid is added to a metal carbonate.