Pyrovanadium acid

Pyrovanadium acid
Pyrovanadium acid
Are common
Systematic ; name	Pyrovanadium acid
Traditional names	Vanadium acid
Chem. formula	H 4 V 2 O 7
Physical properties
condition	light yellow amorphous substance
Molar mass	217.91 g / mol
Chemical properties
Solubility in water	not soluble
Classification
PubChem
Smiles
Inchi
ChemSpider

Pyrovanadium acid is an inorganic compound, a weak acid with the formula H ₄ V ₂ O ₇ , a light yellow amorphous substance, does not dissolve in water.

Content

Getting

Formed by the action of water vapor on vanadium (V) oxide :

{\mathsf {V_{2}O_{5}+2H_{2}O\ {\xrightarrow {100^{o}C}}\ H_{4}V_{2}O_{7}}}

{\ displaystyle {\ mathsf {V_ {2} O_ {5} + 2H_ {2} O \ {\ xrightarrow {100 ^ {o} C}} \ H_ {4} V_ {2} O_ {7}}}}

The effect of sulfuric acid on calcium pyrovanadate:

{\mathsf {Ca_{2}V_{2}O_{7}+2H_{2}SO_{4}\ {\xrightarrow {}}\ H_{4}V_{2}O_{7}+2CaSO_{4}}}

{\ displaystyle {\ mathsf {Ca_ {2} V_ {2} O_ {7} + 2H_ {2} SO_ {4} \ {\ xrightarrow {}} \ H_ {4} V_ {2} O_ {7} + 2CaSO_ {four}}}}

Physical Properties

Pyrovanadic acid forms a pale yellow amorphous substance.

Chemical Properties

Reacts with alkalis:

{\mathsf {H_{4}V_{2}O_{7}+4NaOH\ {\xrightarrow {}}\ Na_{4}V_{2}O_{7}+4H_{2}O}}

{\ displaystyle {\ mathsf {H_ {4} V_ {2} O_ {7} + 4NaOH \ {\ xrightarrow {}} \ Na_ {4} V_ {2} O_ {7} + 4H_ {2} O}}}

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1988. - T. 1. - 623 p.
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Greenwood N., Earnshaw A. Chemistry of elements. - Binom. Laboratory of knowledge, 2008. - T. 2. - 666 p. - ISBN 978-5-94774-372-2 .