Barium acetate

Structural formula
${\displaystyle \mathrm {\ {\Biggl [}} }$ ${\displaystyle \mathrm {\ \!\ {\Biggr ]}_{2}} }$
General
Surname	Barium acetate
Molecular formula	C 4 H 6 BaO 4
Brief description	white odorless crystals,
External identifiers / databases
CAS number 543-80-6 (pure substance) 5908-64-5 (monohydrate) EC number 208-849-0 ECHA InfoCard 100.008.045 PubChem 10980 ChemSpider 10515 Wikidata Q421133
properties
Molar mass	255.42 g · mol -1 (neat) 273.43 g mol −1 (monohydrate)
Physical state	firmly
density	2.47 g cm −3 (20 ° C) (pure substance) 2.19 g cm −3 (monohydrate)
Melting point	450 ° C
solubility	good in water (588 g l −1 at 0 ° C, 720 g l −1 at 20 ° C) slightly soluble in ethanol
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary Caution H and P phrases H: 302 + 332 P: 261-301 + 312 + 330
Toxicological data	921 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Barium acetate is a chemical compound from the group of barium compounds and acetates with the constitutional formula Ba (CH ₃ COO) ₂ .

Manufacturing

Barium acetate can be prepared by reacting barium carbonate or barium sulfide with acetic acid.

${\displaystyle \mathrm {BaCO_{3}+2\ CH_{3}COOH\longrightarrow Ba(CH_{3}COO)_{2}+H_{2}O+CO_{2}\uparrow } }$

${\displaystyle \mathrm {BaS+2\ CH_{3}COOH\longrightarrow Ba(CH_{3}COO)_{2}+H_{2}S\uparrow } }$

properties

Barium acetate exists in three different crystal structures: below 24.7 ° C as a trihydrate (CH ₃ COO) ₂ Ba 3 H ₂ O in the monoclinic crystal system , between 24.7 ° C and 41 ° C as a monohydrate (CH ₃ COO) ₂ Ba · H ₂ O in the triclinic crystal system and above 41 ° C in the form of the anhydrous salt. The latter crystallizes in the tetragonal crystal system in the space group I 4 ₁ / a (space group no. 88) with the lattice parameters a = 990.1  pm and b = 2736.2 pm. In the unit cell contains 16  formula units . The crystals of the anhydrate are not hygroscopic. The solubility curve has clear kinks at the transition points.

The standard enthalpy of formation of barium acetate is −1486 kJ / mol.

Web links

• IR spectrum of barium acetate
• Raman spectrum of barium acetate

Individual evidence

1. ↑ ^{a b c} data sheet barium acetate from AlfaAesar, accessed on June 2, 2010 ( PDF )(JavaScript required) .
2. ↑ ^{a b} Dale L. Perry, Sidney L. Phillips: Handbook of Inorganic Compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , p. 45 ( limited preview in Google book search).
3. ↑ ^{a b} Data sheet barium acetate (PDF) from Merck , accessed on June 2, 2010.
4. ^ ^{A b c} Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists. 3. Elements, inorganic compounds and materials, Minerals, Volume 3. 4. Edition, Springer, 1997, ISBN 978-3-5406-0035-0 , p. 323 ( limited preview in Google book search).
5. ↑ ^{a b c} Entry on barium acetate in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
6. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entry barium salts, with the exception of barium sulphate, salts of 1-azo-2-hydroxynaphthalenyl aryl sulphonic acid, and of salts specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
7. ^ R. Abegg , F. Auerbach : "Handbuch der inorganic Chemie". Verlag S. Hirzel, Vol. 2, 1908. P. 287f. Full text
8. ^ I. Gautier-Luneau, A. Mosset: "Crystal structure of anhydrous barium acetate" in Journal of Solid State Chemistry 1988 , 73 (2), pp. 473-479. doi : 10.1016 / 0022-4596 (88) 90133-8
9. ^ Georg Bredig , Wilhelm Bachmann : "Handbook of applied physical chemistry in individual presentations, 1907. Verlag JA Barth, Volume 5, p. 89. Full text