Iron(III) chloride solution is widely used in water treatment processes as a coagulant to remove impurities and suspended particles from drinking water and wastewater. It helps in the purification process by promoting the aggregation of fine particles, making them easier to filter out.

In the electronics industry, it serves as an etchant for copper-based printed circuit boards (PCBs). The solution effectively removes unwanted copper layers, creating precise circuit patterns required for electronic devices.

It is also employed in the production of dyes and pigments, acting as a catalyst or mordant to fix colors onto fabrics and other materials, ensuring long-lasting and vibrant results.

Additionally, it finds application in the paper and pulp industry to improve paper quality and assist in the dyeing process.

Furthermore, it is used in the pharmaceutical industry as a reagent in the synthesis of various drugs and organic compounds, aiding in chemical reactions and purification processes.