>
Fa   |   Ar   |   En
   Dissolution and Solubility of the (B a x S r 1 - X)HAsO4· h2O Solid Solution in Aqueous Solution at 25°C and pH 2  
   
نویسنده zhang x. ,zhu y. ,wei c. ,zhu z. ,li z.
منبع journal of chemistry - 2014 - دوره : 2014 - شماره : 0
چکیده    Six different members of the (ba x sr 1 - x)haso4·h 2o solid solution were prepared and characterized,and then dissolution of the synthetic solids was studied at 25°c and ph 2 in a series of batch experiments for 4320 h. with the increase in the ba/(ba + sr) mole fraction of the solids,the aqueous ph decreased and the aqueous barium concentration increased. the aqueous strontium and arsenic concentrations had the highest values at ba / (ba + sr) = 0.21. the solubility products for bahaso4·h2o and srhaso4·h 2o were calculated to be 10 - 5.52 and 10 - 4.62,respectively. the corresponding free energies of formation were determined to be - 1543.99 ± 0.18 kj/mol and - 1537.94 ± 0.02 kj/mol. the solid solution had a minimum solubility product of 10 - 5.61 at ba / (ba + sr) = 0.82. the guggenheim coefficients were determined to be a o = 1.55 and a 1 = - 4.35. the lippmann diagram was a typical lippmann diagram for a nonideal solid solution with a negative enthalpy of mixing. the system shows an alyotropic minimum at the aqueous ba / (ba + sr) activity fraction of 0.87 where the solutus and solidus curves meet. at the end of the dissolution experiment,the dissolution followed the saturation curve for the pure endmember bahaso 4 ·h2o and approached the intersection with the minimum stoichiometric saturation curve on the lippmann diagram. © 2014 xuehong zhang et al.
آدرس college of environmental science and engineering,guilin university of technology, China, college of environmental science and engineering,guilin university of technology, China, college of environmental science and engineering,guilin university of technology,guilin 541004,china,college of light industry and food engineering,guangxi university, China, college of environmental science and engineering,guilin university of technology, China, college of environmental science and engineering,guilin university of technology, China
 
     
   
Authors
  
 
 

Copyright 2023
Islamic World Science Citation Center
All Rights Reserved