3CaCl₂ (aq) + Al₂(SO₄)₃ (aq) → 3CaSO₄ (s) + 2AlCl₃ (aq)
Explanation:
* Reactants:
* Calcium chloride (CaCl₂) is a soluble ionic compound.
* Aluminum sulfate (Al₂(SO₄)₃) is also a soluble ionic compound.
* Products:
* Calcium sulfate (CaSO₄) is an insoluble ionic compound. This means it forms a solid precipitate in the reaction.
* Aluminum chloride (AlCl₃) is a soluble ionic compound.
Double displacement reactions occur when the positive and negative ions of two reactants switch places. In this case, the calcium ions (Ca²⁺) from calcium chloride combine with the sulfate ions (SO₄²⁻) from aluminum sulfate to form calcium sulfate. Similarly, the aluminum ions (Al³⁺) from aluminum sulfate combine with the chloride ions (Cl⁻) from calcium chloride to form aluminum chloride.
Key points:
* The reaction is balanced, meaning there are equal numbers of each type of atom on both sides of the equation.
* The state symbols (aq) indicate that the compounds are dissolved in water (aqueous).
* The state symbol (s) indicates that calcium sulfate is a solid precipitate.
