To classify the chemical reaction represented by the equation CaCO3 + 2HCl ⟶ CaCl2 + H2CO3, we first need to analyze the reactants and products involved.
This reaction involves calcium carbonate (CaCO3) reacting with hydrochloric acid (HCl) to produce calcium chloride (CaCl2) and carbonic acid (H2CO3). Here are the classifications:
- Synthesis Reaction: This is when two or more reactants combine to form a single product. This does not fit our reaction.
- Decomposition Reaction: This involves a single compound breaking down into two or more products. This is not applicable here either.
- Single Displacement Reaction: This occurs when one element displaces another in a compound. Again, this does not match our equation.
- Double Displacement Reaction: This reaction involves the exchange of ions between two compounds to form new compounds, which is exactly what happens in this case.
Given that both reactants exchange parts to form two new products, we can conclude that this reaction is best classified as a double displacement reaction.