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Yttrium hydroxide

Yttrium(III) hydroxide is an inorganic compound and an alkali with the chemical formula Y(OH)<sub>3</sub>.

Production

Yttrium(III) hydroxide can be produced by reacting yttrium(III) nitrate and sodium hydroxide in aqueous solution:

Y(NO<sub>3</sub>)<sub>3</sub> + 3 NaOH → Y(OH)<sub>3</sub>↓ + 3 NaNO<sub>3</sub>

This gives yttrium(III) hydroxide as a white gelatinous precipitate, which can be dried to a white powder.

Chemical properties

Yttrium(III) hydroxide is an alkali, so it can react with acid:

Y(OH)<sub>3</sub> + 3 HNO<sub>3</sub> → Y(NO<sub>3</sub>)<sub>3</sub> + 3 H<sub>2</sub>O
2 Y(OH)<sub>3</sub> + 3 H<sub>2</sub>SO<sub>4</sub> → Y<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> + 3 H<sub>2</sub>O

The compound absorbs atmospheric carbon dioxide.

When heated, yttrium(III) hydroxide will decompose:

2 Y(OH)<sub>3</sub> → Y<sub>2</sub>O<sub>3</sub> + 3 H<sub>2</sub>O↑

References