Cobalt oxide (IV)

Cobalt (IV) oxide is an inorganic compound, cobalt metal oxide hydrate with the formula CoO ₂ • H ₂ O, black powder, does not dissolve in water.

Content

{\mathsf {Co+2OH^{-}+H_{2}O\ {\xrightarrow {e^{-}}}\ CoO_{2}\cdot H_{2}O\downarrow +H_{2}\uparrow }}

{\ displaystyle {\ mathsf {Co + 2OH ^ {-} + H_ {2} O \ {\ xrightarrow {e ^ {-}}} \ CoO_ {2} \ cdot H_ {2} O \ downarrow + H_ {2 } \ uparrow}}}

The action of an alkaline solution of iodine on a solution of cobalt (III) sulfate :

{\mathsf {Co_{2}(SO_{4})_{3}+I_{2}+8KOH\ {\xrightarrow {}}\ 2CoO_{2}\cdot H_{2}O\downarrow +2KI+3K_{2}SO_{4}+2H_{2}O}}

{\ displaystyle {\ mathsf {Co_ {2} (SO_ {4}) _ {3} + I_ {2} + 8KOH \ {\ xrightarrow {}} \ 2CoO_ {2} \ cdot H_ {2} O \ downarrow + 2KI + 3K_ {2} SO_ {4} + 2H_ {2} O}}}

Cobalt (IV) oxide forms a black powder.

Not soluble in water.

{\mathsf {CoO_{2}\cdot H_{2}O+Na_{2}O\ {\xrightarrow {}}\ Na_{2}CoO_{3}+H_{2}O}}

{\ displaystyle {\ mathsf {CoO_ {2} \ cdot H_ {2} O + Na_ {2} O \ {\ xrightarrow {}} \ Na_ {2} CoO_ {3} + H_ {2} O}}}

{\mathsf {CoO_{2}\cdot H_{2}O+MgO\ {\xrightarrow {}}\ MgCoO_{3}+H_{2}O}}

{\ displaystyle {\ mathsf {CoO_ {2} \ cdot H_ {2} O + MgO \ {\ xrightarrow {}} \ MgCoO_ {3} + H_ {2} O}}}

{\mathsf {CoO_{2}\cdot H_{2}O+2BaO\ {\xrightarrow {}}\ Ba_{2}CoO_{4}+H_{2}O}}

{\ displaystyle {\ mathsf {CoO_ {2} \ cdot H_ {2} O + 2BaO \ {\ xrightarrow {}} \ Ba_ {2} CoO_ {4} + H_ {2} O}}}

Ripan R., Chetyanu I. Inorganic chemistry. Chemistry of metals. - M .: Mir, 1972. - T. 2. - 871 p.