How is Cerium(4+) tetrahydroxide (CAS: 12014-56-1) typically synthesized?

Cerium(4+) tetrahydroxide (CAS: 12014-56-1) can be synthesized by the hydrolysis of ceric salts in the presence of sodium hydroxide or potassium hydroxide. Common methods include the precipitation of cerium(IV) ions from a solution of cerium(IV) nitrate or cerium(IV) chloride with sodium or potassium hydroxide. The reaction is typically carried out at room temperature or slightly elevated temperatures, with a yield of around 85-95% depending on the purity of starting materials and reaction conditions.