Iron alum, also known as ferric sulfate, refers to a chemical compound used for various purposes. It serves as a vital coagulant in wastewater treatment, aiding in the removal of impurities. Additionally, it can act as a mordant in dyeing processes, ensuring permanent color fixation on fabrics. Synonymous terms for iron alum include ferric ammonium sulfate, iron(III) sulfate, or iron(iii) ammonium sulfate. These alternative names highlight the compound's composition and molecular structure. Whether mentioned as iron alum or by its synonymous terms, this versatile substance remains crucial in several industrial applications due to its exceptional coagulating and mordant properties.