Used as a reagent in analytical chemistry for the detection and estimation of reducing sugars and other reducing substances. It serves as a source of copper ions in catalytic reactions and in the preparation of other copper-based compounds. Employed in electroplating baths to deposit copper coatings with controlled morphology and adhesion properties. Utilized in educational laboratories for demonstrating coordination chemistry and redox reactions. Also finds use in the textile industry as a mordant in dyeing processes to improve color fastness.