Write the formula of bases corresponding to the oxides CuO, FeO, Fe2O3. Are they soluble in water or not? What are they called?

Copper oxide CuO corresponds to the base Cu (OH) 2, which is called copper hydroxide. Copper hydroxide is practically insoluble in water.
Iron oxide bivalent FeO corresponds to the base Fe (OH) 2, which is called bivalent iron hydroxide. This base is insoluble in water (solubility 5.810-6 mol / l).
Trivalent iron oxide Fe2O3 corresponds to the base Fe (OH) 3, which is called trivalent iron hydroxide. This base is insoluble in water and easily forms colloidal solutions.