Rhodium (III) hydroxide

Rhodium hydroxide
Rhodium hydroxide
Are common
Systematic ; name	Rhodium (III) hydroxide
Traditional names	Rhodium hydroxide
Chem. formula	Rh (OH) 3
Physical properties
condition	black or lemon yellow precipitate
Molar mass	153.93 g / mol
Thermal properties
T.	200 ° C
Classification
Reg. CAS number	21656-02-0, 39373-27-8, 123542-79-0
Reg. EINECS number	244-508-2

Rhodium (III) hydroxide is an inorganic compound, rhodium hydroxide with the formula Rh (OH) ₃ , a black or lemon yellow precipitate, does not dissolve in water.

Content

Getting

The alkali precipitation of a solution of sodium hexachloride (III) sodium :

{\mathsf {Na_{3}[RhCl_{6}]+3NaOH\ {\xrightarrow {}}\ Rh(OH)_{3}\downarrow +6NaCl}}

{\ displaystyle {\ mathsf {Na_ {3} [RhCl_ {6}] + 3NaOH \ {\ xrightarrow {}} \ Rh (OH) _ {3} \ downarrow + 6NaCl}}}

{\mathsf {2Rh(OH)_{3}+2H_{2}O{\xrightarrow {}}\ Rh_{2}O_{3}\cdot 5H_{2}O\downarrow }}

{\ displaystyle {\ mathsf {2Rh (OH) _ {3} + 2H_ {2} O {\ xrightarrow {}} \ Rh_ {2} O_ {3} \ cdot 5H_ {2} O \ downarrow}}}

Physical Properties

Rhodium (III) hydroxide forms a black precipitate of Rh (OH) ₃ , which on standing turns into a lemon yellow precipitate of composition Rh ₂ O ₃ • 5H ₂ O.

Not soluble in water.

Chemical Properties

Decomposes when heated:

{\mathsf {2Rh(OH)_{3}\ {\xrightarrow {200^{o}C}}\ Rh_{2}O_{3}+3H_{2}O}}

{\ displaystyle {\ mathsf {2Rh (OH) _ {3} \ {\ xrightarrow {200 ^ {o} C}} \ Rh_ {2} O_ {3} + 3H_ {2} O}}}

Literature

Chemical Encyclopedia / Redkol .: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1995. - Vol. 4. - 639 p. - ISBN 5-85270-092-4 .
Chemist Handbook / Redkol .: Nikolsky B.P. et al. - 3rd ed., Rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Manual on inorganic synthesis: B 6 tons / Ed. Brower G. .. - M .: Mir, 1985. - V. 5. - 360 p.
CRC Handbook of Chemistry and Physics . - 89th edition. - Taylor and Francis Group, LLC, 2008-2009.
Chemical Encyclopedic Dictionary / Redkol .: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1983. - 792 p.