f">

600

\circ

C

G

e

+

2

H

2

O

{\ displaystyle {\ mathsf {GeO_ {2} + 2H_ {2} {\ xrightarrow {600 ~ ^ {\ circ} {\ text {C}}}} Ge + 2H_ {2} O}}}

{\mathsf {GeO_{2}+C{\xrightarrow {500{-}600~^{\circ }{\text{C}}}}Ge+CO_{2}}}

{\ displaystyle {\ mathsf {GeO_ {2} + C {\ xrightarrow {500 {-} 600 ~ ^ {\ circ} {\ text {C}}}} Ge + CO_ {2}}}}

Germanium dioxide is soluble in water, forming a weak metagermanic acid :

{\mathsf {GeO_{2}+H_{2}O\longrightarrow H_{2}GeO_{3}}}

{\ displaystyle {\ mathsf {GeO_ {2} + H_ {2} O \ longrightarrow H_ {2} GeO_ {3}}}}

{\mathsf {H_{2}GeO_{3}+H_{2}O\rightleftarrows HGeO_{3}^{-}+H_{3}O^{+}}};\quad pK=8{,}73

{\ displaystyle {\ mathsf {H_ {2} GeO_ {3} + H_ {2} O \ rightleftarrows HGeO_ {3} ^ {-} + H_ {3} O ^ {+}}}; \ quad pK = 8 { ,} 73}

{\mathsf {HGeO_{3}^{+}+H_{2}O\rightleftarrows GeO_{3}^{2+}+H_{3}O^{+}}};\quad pK=12{,}72

{\ displaystyle {\ mathsf {HGeO_ {3} ^ {+} + H_ {2} O \ rightleftarrows GeO_ {3} ^ {2 + + H_ {3} O ^ {+}}}; \ quad pK = 12 {,} 72}

It dissolves in alkalis, forms diluted metagermanic acid salts with dilute, orthogermanic: with concentrated salts:

{\mathsf {GeO_{2}+2NaOH{\xrightarrow {<20\,\%}}Na_{2}GeO_{3}+H_{2}O}}