Thorium(IV) hydroxide

Thorium hydroxide is an inorganic compound with a chemical formula Th₄.

Production

Thorium hydroxide can be produced by reacting alkali metal hydroxides like sodium hydroxide and potassium hydroxide and soluble thorium salts, such as thorium nitrate.

Reactions

New thorium hydroxide is soluble in acid but its solubility will decrease when older.
At above 470 °C, thorium hydroxide will continuously decompose and produce thorium dioxide:
Thorium hydroxide reacts with carbon dioxide gas. Under ambient conditions this produces the hydrated oxide carbonate ThOCO₃·xH₂O, and under higher pressure this produces thorium carbonate hemihydrate.