Iridium (III) Sulfate

Iridium sulfate
Iridium sulfate
Are common
Systematic ; name	Iridium (III) Sulfate
Traditional names	iridium sulfate
Chem. formula	Ir 2 (SO 4 ) 3
Physical properties
condition	yellow crystals
Molar mass	672.63 g / mol
Classification
Reg. CAS number
PubChem
Reg. EINECS number
Smiles
Inchi
ChemSpider

Iridium (III) sulfate is an inorganic compound, a salt of a metal of iridium and sulfuric acid with the formula Ir ₂ (SO ₄ ) ₃ , yellow crystals, hydrolyzed by water, stable in acidified solutions, isolated only in the form of crystalline hydrate .

Content

Getting

Dissolution of iridium (III) oxide in dilute sulfuric acid in an inert atmosphere:

{\mathsf {Ir_{2}O_{3}+3H_{2}SO_{4}\ {\xrightarrow {N_{2}}}\ Ir_{2}(SO_{4})_{3}+3H_{2}O}}

{\ displaystyle {\ mathsf {Ir_ {2} O_ {3} + 3H_ {2} SO_ {4} \ {\ xrightarrow {N_ {2}}} \ Ir_ {2} (SO_ {4}) _ {3} + 3H_ {2} O}}}

Dissolution of sodium hexachloroiridate (III) in hot sulfuric acid :

{\mathsf {2Na_{3}[IrCl_{6}]+6H_{2}SO_{4}\ {\xrightarrow {100^{o}C}}\ Ir_{2}(SO_{4})_{3}+3Na_{2}SO_{4}+12HCl\uparrow }}

{\ displaystyle {\ mathsf {2Na_ {3} [IrCl_ {6}] + 6H_ {2} SO_ {4} \ {\ xrightarrow {100 ^ {o} C}} \ Ir_ {2} (SO_ {4}) _ {3} + 3Na_ {2} SO_ {4} + 12HCl \ uparrow}}}

Physical Properties

Iridium (III) sulfate forms yellow crystals, which are crystalline hydrates of nonstoichiometric composition Ir ₂ (SO ₄ ) ₃ • n H ₂ O.

It is soluble in acidified solutions.

Chemical Properties

Decomposes on heating:

{\mathsf {Ir_{2}(SO_{4})_{3}\cdot nH_{2}O\ {\xrightarrow {300-400^{o}C}}\ Ir_{2}O_{3}+3SO_{3}+nH_{2}O}}

{\ displaystyle {\ mathsf {Ir_ {2} (SO_ {4}) _ {3} \ cdot nH_ {2} O \ {\ xrightarrow {300-400 ^ {o} C}} \ Ir_ {2} O_ { 3} + 3SO_ {3} + nH_ {2} O}}}

Reacts with concentrated sulfuric acid to form an acid salt:

{\mathsf {Ir_{2}(SO_{4})_{3}+3H_{2}SO_{4}\ {\xrightarrow {}}\ 2H_{3}[Ir(SO_{4})_{3}]}}

{\ displaystyle {\ mathsf {Ir_ {2} (SO_ {4}) _ {3} + 3H_ {2} SO_ {4} \ {\ xrightarrow {}} \ 2H_ {3} [Ir (SO_ {4}) _ {3}]}}}

It is oxidized by concentrated hot nitric acid :

{\mathsf {Ir_{2}(SO_{4})_{3}+2HNO_{3}+2H_{2}O\ {\xrightarrow {100^{o}C}}\ 2IrO_{2}\downarrow +2NO_{2}\uparrow +3H_{2}SO_{4}}}

{\ displaystyle {\ mathsf {Ir_ {2} (SO_ {4}) _ {3} + 2HNO_ {3} + 2H_ {2} O \ {\ xrightarrow {100 ^ {o} C}} \ 2IrO_ {2} \ downarrow + 2NO_ {2} \ uparrow + 3H_ {2} SO_ {4}}}}

Reacts with alkalis :

{\mathsf {Ir_{2}(SO_{4})_{3}+6NaOH\ {\xrightarrow {}}\ 2Ir_{2}O_{3}\downarrow +3Na_{2}SO_{4}+3H_{2}O}}

{\ displaystyle {\ mathsf {Ir_ {2} (SO_ {4}) _ {3} + 6NaOH \ {\ xrightarrow {}} \ 2Ir_ {2} O_ {3} \ downarrow + 3Na_ {2} SO_ {4} + 3H_ {2} O}}}

In alkaline solutions, it is slowly oxidized by atmospheric oxygen :

{\mathsf {2Ir_{2}(SO_{4})_{3}+O_{2}+12NaOH\ {\xrightarrow {}}\ 4IrO_{2}\downarrow +6Na_{2}SO_{4}+6H_{2}O}}

{\ displaystyle {\ mathsf {2Ir_ {2} (SO_ {4}) _ {3} + O_ {2} + 12NaOH \ {\ xrightarrow {}} \ 4IrO_ {2} \ downarrow + 6Na_ {2} SO_ {4 } + 6H_ {2} O}}}

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1990. - T. 2. - 671 p. - ISBN 5-82270-035-5 .
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Lidin R.A. and other Chemical properties of inorganic substances: Textbook. manual for universities. - 3rd ed., Rev. - M .: Chemistry, 2000 .-- 480 p. - ISBN 5-7245-1163-0 .
Ripan R., Chetyanu I. Inorganic chemistry. Chemistry of metals. - M .: Mir, 1972. - T. 2. - 871 p.