Europium oxalate (III)

Oxalate europium
Oxalate europium
Are common
Systematic ; name	Europium oxalate (III)
Traditional names	Oxalate europium
Chem. formula	Eu 2 (C 2 O 4 ) 3
Physical properties
condition	colorless (white) crystals
Molar mass	567.99 g / mol
Chemical properties
Solubility in water	0.0001 g / 100 ml
Classification
Reg. CAS number	3269-12-3
Reg. EINECS number

Europium (III) oxalate is an inorganic compound, a salt of europium and oxalic acid with the formula Eu ₂ (C ₂ O ₄ ) ₃ , colorless (white) crystals, does not dissolve in water, forms a crystalline hydrate .

Content

Getting

Precipitation with oxalic acid from acidified solutions of europium salts:

{\mathsf {2EuCl_{3}+3H_{2}C_{2}O_{4}+10H_{2}O\ {\xrightarrow {}}\ Eu_{2}(C_{2}O_{4})_{3}\cdot 10H_{2}O\downarrow +6HCl}}

{\ displaystyle {\ mathsf {2EuCl_ {3} + 3H_ {2} C_ {2} O_ {4} + 10H_ {2} O \ {\ xrightarrow {}} \ Eu_ {2} (C_ {2} O_ {4 }) _ {3} \ cdot 10H_ {2} O \ downarrow + 6HCl}}}

Physical Properties

Europium (III) oxalate forms colorless (white) crystals.

Practically insoluble in water, the solubility of anhydrous oxalate is 1.05 mg / l, the solubility product is 10 ^-26.6 . It is soluble in weak solutions of acids.

Forms a crystalline hydrate of the composition Eu ₂ (C ₂ O ₄ ) ₃ • 10H ₂ O.

Chemical Properties

Crystalline hydrate stepwise loses water in the temperature range 55 - 140 ° C.

With moderate heating of the crystalline hydrate, oxocarbonate is formed:

{\mathsf {Eu_{2}(C_{2}O_{4})_{3}\cdot 10H_{2}O\ {\xrightarrow {400-420^{o}C}}\ Eu_{2}O_{2}CO_{3}+2CO_{2}+3CO+10H_{2}O}}

{\ displaystyle {\ mathsf {Eu_ {2} (C_ {2} O_ {4}) _ {3} \ cdot 10H_ {2} O \ {\ xrightarrow {400-420 ^ {o} C}} \ Eu_ { 2} O_ {2} CO_ {3} + 2CO_ {2} + 3CO + 10H_ {2} O}}}

Decomposes on high heat:

{\mathsf {Eu_{2}(C_{2}O_{4})_{3}\ {\xrightarrow {800-1000^{o}C}}\ Eu_{2}O_{3}+3CO_{2}+3CO}}

{\ displaystyle {\ mathsf {Eu_ {2} (C_ {2} O_ {4}) _ {3} \ {\ xrightarrow {800-1000 ^ {o} C}} \ Eu_ {2} O_ {3} + 3CO_ {2} + 3CO}}}

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1990. - T. 2. - 671 p. - ISBN 5-82270-035-5 .
CRC Handbook of Chemistry and Physics . - 89th Edition. - Taylor and Francis Group, LLC, 2008-2009.
Komissarova LN, Shatsky VM, Pushkin and others. Compounds of rare earth elements. Carbonates, oxalates, nitrates, titanates. - M .: Nauka, 1984. - 235 p.