Answer:
CaCO₃ (aq) + H₂SO₄ (aq) → H₂CO₃(aq) + CaSO₄(s) ↓
Explanation:
Aqueous solutions of CaCO₃ and H₂SO₄ can be mixed to form, two products, the calcium sulfate and carbonic acid.
In order the find the products, we can dissociate the reactants:
CaCO₃ → Ca²⁺ + CO₃⁻²
H₂SO₄ → 2H⁺ + SO₄⁻²
So, the protons will be catch by the carbonate and the calcium will form a precipitate with the sulfate. As Ca is an element from group 2, remember that sulfates can make precipitate with these elements (Ca, Ba and Mg)
Ca²⁺ + SO₄⁻² → CaSO₄
2H⁺ + CO₃⁻² ⇄ H₂CO₃ (Carbonic acid is a weak one, so in the reaction we add two arrows, because it is an equilibrium acid/base)
We add the phases to the main reaction:
CaCO₃ (aq) + H₂SO₄ (aq) → H₂CO₃(aq) + CaSO₄(s) ↓
