Effervescence: The reaction between calcium carbonate and hydrochloric acid produces carbon dioxide gas (CO2) as one of the products. The formation of CO2 gas leads to the evolution of bubbles or effervescence in the reaction mixture. This is due to the escape of CO2 gas from the solution.
Fizzing Sound: As the carbon dioxide gas is released, a fizzing sound can be heard. This sound is produced by the bubbles of CO2 gas escaping from the reaction mixture.
Temperature Change: The reaction between calcium carbonate and hydrochloric acid is exothermic, meaning that it releases heat. As a result, there may be a slight increase in the temperature of the reaction mixture during the reaction.
Formation of Calcium Chloride: Another product of the reaction is calcium chloride (CaCl2). Calcium chloride is soluble in water, so it remains dissolved in the solution.
Disappearance of Solid: As the reaction progresses, the solid calcium carbonate gradually dissolves in the hydrochloric acid, resulting in the disappearance of the solid reactant.
Overall, the reaction between calcium carbonate and hydrochloric acid can be characterized by the formation of bubbles (effervescence), a fizzing sound, a slight temperature increase, and the disappearance of the solid reactant.
