Which substance is used to remove rust from metal? Iye (NaOH) hydrochloric acid (HCl) ammonia (NH_(3)) sulfuric acid (H_(2)SO_(4))^circ

The substance commonly used to remove rust from metal is hydrochloric acid (HCl). Rust is a form of iron oxide that forms on the surface of iron or steel when it is exposed to moisture and oxygen. Hydrochloric acid is an effective rust remover because it reacts with the iron oxide to produce iron chloride, which can be easily washed away.<br /><br />The reaction between hydrochloric acid and iron oxide can be represented as follows:<br /><br />Fe2O3 + 6HCl → 2FeCl3 + 3H2O<br /><br />In this reaction, iron oxide (Fe2O3) reacts with hydrochloric acid (HCl) to produce iron chloride (FeCl3) and water (H2O). The iron chloride can then be washed away, leaving the metal surface clean and free of rust.<br /><br />It is important to note that hydrochloric acid should be handled with care, as it is a strong acid and can be corrosive to skin and other materials. It is recommended to wear protective gloves and eye protection when using hydrochloric acid, and to work in a well-ventilated area.