The reaction between oxalic acid (H₂C₂O₄) and ammonium hydroxide (NH₄OH) is a neutralization reaction that produces ammonium oxalate (NH₄)₂C₂O₄ and water (H₂O).

Here's the balanced chemical equation:

H₂C₂O₄ (aq) + 2 NH₄OH (aq) → (NH₄)₂C₂O₄ (aq) + 2 H₂O (l)

Explanation:

* Oxalic acid is a diprotic acid, meaning it can donate two hydrogen ions (H⁺).

* Ammonium hydroxide is a weak base, providing hydroxide ions (OH⁻).

* When these react, the H⁺ from the acid combines with the OH⁻ from the base to form water.

* The remaining ions, ammonium (NH₄⁺) and oxalate (C₂O₄²⁻), form the salt ammonium oxalate.

Observations:

* The reaction is exothermic, meaning it releases heat.

* If the concentration of the reactants is high, a white precipitate of ammonium oxalate may form.

Uses:

* Ammonium oxalate is used in analytical chemistry as a precipitant for calcium and other metals.

* It is also used as a mordant in dyeing and as a reducing agent in photography.