Copper nitrate hydrate is widely used as a catalyst in organic synthesis, particularly in oxidation and nitration reactions. It plays a key role in the production of other copper-based chemicals and serves as a precursor in the synthesis of copper oxide nanoparticles, which have applications in electronics and sensors.

In industrial settings, it is employed in metal etching and as a mordant in dyeing textiles, helping dyes adhere more effectively to fabrics. It is also used in educational laboratories for demonstrating chemical reactions, such as decomposition processes that produce nitrogen dioxide and copper oxide.

Additionally, copper nitrate hydrate finds use in electroplating processes, where it contributes to the deposition of copper coatings on various substrates, enhancing conductivity and corrosion resistance. Its ability to act as a nitrating agent makes it valuable in the preparation of explosives and pharmaceuticals.