Here's why:

* Ionic Compounds: Copper(II) hydroxide is an ionic compound, meaning it's formed from the attraction between positively charged copper ions (Cu²⁺) and negatively charged hydroxide ions (OH⁻).

* Solubility Rules: Generally, hydroxides of transition metals (like copper) are insoluble in water.

* Amphoteric Nature: While Cu(OH)₂ is mostly insoluble, it does exhibit slightly amphoteric behavior, meaning it can react with both acids and bases. This means it can dissolve in strong acids or strong bases, but not in pure water.

In summary, Copper(II) hydroxide is considered insoluble in water.