The reaction between ammonium oxalate ((NH₄)₂C₂O₄) and calcium chloride (CaCl₂) results in the formation of a white precipitate of calcium oxalate (CaC₂O₄) and ammonium chloride (NH₄Cl) which remains dissolved in the solution.

Here is the balanced chemical equation:

(NH₄)₂C₂O₄ (aq) + CaCl₂ (aq) → CaC₂O₄ (s) + 2 NH₄Cl (aq)

Explanation:

* (NH₄)₂C₂O₄ (aq) represents ammonium oxalate dissolved in water (aqueous solution).

* CaCl₂ (aq) represents calcium chloride dissolved in water.

* CaC₂O₄ (s) represents calcium oxalate, a white solid precipitate.

* 2 NH₄Cl (aq) represents two moles of ammonium chloride dissolved in water.

Key Points:

* This reaction is a double displacement reaction where the cations and anions of the reactants switch places.

* The formation of the insoluble calcium oxalate precipitate is the driving force behind this reaction.

* The reaction is balanced with equal numbers of each type of atom on both sides of the equation.

This reaction is commonly used in analytical chemistry to determine the concentration of calcium ions in solution, as calcium oxalate is very insoluble and easily filtered out.