title: Solubility and stability of barium arsenate and barium hydrogen arsenate at 25 degrees C.
abstract: The inconsistency among current thermodynamic data of Ba3(AsO4)2(c) and BaHAsO4.H2O(c) led the authors to obtain independent solubility data of barium arsenate by both precipitation and dissolution experiments. Low and neutral pH (3.63-7.43) favored the formation of BaHAsO4.H2O(c). Both BaHAsO4.H2Oc and Ba3(AsO4)2(c) formed at the neutral pH conditions (7.47, 7.66), whereas Ba3(AsO4)2(c) was the only solid phase precipitated at high pH (13.03, 13.10). The Ba3(AsO4)2(c) precipitate acquired at 50 degrees C appeared as small leafy crystal, while the Ba3(AsO4)2(c) solid precipitated at 25 degrees C comprised granular aggregate with some smaller crystal clusters. XRD and SEM analyses of Ba3(AsO4)2(c) and BaHAsO4.H2O(c) indicated that the solids were indistinguishable before and after the dissolution experiments. In the present work, the solubility products (Ksp) for Ba3(AsO4)2(c) and BaHAsO4.H2O(c) were determined to be 10(-23.53)(10(-23.01) to 10(-24.00)) and 10(-5.60)(10(-5.23) to 10(-5.89)), respectively. DeltaGf degrees for Ba3(AsO4)2(c) and BaHAsO4.H2O(c) were calculated to be -3113.40 and -1544.47 kJ/mol, respectively. There was no difference between the solubility products of the leafy and the granular Ba3(AsO4)2(c) solids.
authors.affiliation: Department of Resources and Environmental Engineering, Guilin University of Technology, Jian-Gan Road 12, Guilin 541004, Guangxi, China. zhuyinian@163.com
authors.forename: Yinian
authors.initials: Y
authors.lastname: Zhu
authors.forename: Xuehong
authors.initials: X
authors.lastname: Zhang
authors.forename: Qinglin
authors.initials: Q
authors.lastname: Xie
authors.forename: Yudao
authors.initials: Y
authors.lastname: Chen
authors.forename: Dunqiu
authors.initials: D
authors.lastname: Wang
authors.forename: Yanpeng
authors.initials: Y
authors.lastname: Liang
authors.forename: Jie
authors.initials: J
authors.lastname: Lu
mesh_terms: D001149:Arsenates / Q000737:chemistry*; D017609:Barium Compounds / Q000737:chemistry*; D011232:Chemical Precipitation; D004785:Environmental Pollutants; D006863:Hydrogen-Ion Concentration; D012995:Solubility; D013696:Temperature
chemical_list: D001149:Arsenates; D017609:Barium Compounds; D004785:Environmental Pollutants