Phosphoric acid and iron react to form iron(III) phosphate (FePO₄) and hydrogen gas (H₂). This reaction is a classic example of an acid-metal reaction.

Here's the balanced chemical equation:

2 Fe(s) + 2 H₃PO₄(aq) → 2 FePO₄(s) + 3 H₂(g)

Explanation:

* Iron (Fe) is a metal that readily reacts with acids.

* Phosphoric acid (H₃PO₄) is a weak acid.

* The reaction produces iron(III) phosphate (FePO₄), an insoluble solid that precipitates out of the solution.

* Hydrogen gas (H₂) is also produced as a byproduct.

This reaction is often used in the production of iron phosphate, which has various applications, including:

* Pigment production: Iron phosphate is used as a pigment in paints and coatings.

* Corrosion inhibitor: It can help prevent the rusting of iron and steel.

* Feed additive: It is used as a phosphorus supplement in animal feed.

* Ceramic glaze: Iron phosphate is used in ceramic glazes to create unique colors.

Note: This reaction requires heating to proceed at a reasonable rate.