Two pure strontium borates SrB2O4*4H2O and SrB2O4 have been synthesized and characterized by means of chemical analysis and XRD, FT-IR, DTA-TG techniques. The molar enthalpies of solution of SrB2O4*4H2O and SrB2O4 in 1 mol dm-3 HCl(aq) were measured to be -(9.92+-0.20) kJ mol-1 and -(81.27+-0.30) kJ mol-1, respectively. The molar enthalpy of solution of Sr(OH)2*8H2O in (HCl +H3BO3)(aq) were determined to be -(51.69+-0.15) kJ mol-1.With the use of the enthalpy of solution of H3BO3 in 1 mol dm-3 HCl(aq), and the standard molar enthalpies of formation for Sr(OH)2*8H2O(s), H3BO3(s), and H2O(l), the standard molar enthalpies of formation of -(3253.1+-1.7) kJ mol-1 for SrB2O4*4H2O, and of -(2038.4+-1.7) kJ mol-1 for SrB2O4 were obtained.
Compounds
#
Formula
Name
1
BH3O3
boric acid
2
H18O10Sr
strontium hydroxide octahydrate Sr(OH)2*8H2O
3
H2O
water
4
B2H8O8Sr
strontium borate hydrate SrB2O4*4H2O
5
B2O4Sr
strontium borate SrB2O4
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.