The enthalpies of solution of five hydrated calcium berates in approxi
mately 1 mol.dm(-3) aqueous hydrochloric acid were determined. From a
combination of these results with measured enthalpies of solution of H
3BO3 in HCl(aq) and of CaO in (hydrochloric acid + boric acid) (ag), t
ogether with the standard molar enthalpies of formation of CaO(s), H3B
O3(s), and H2O(1), the standard molar enthalpies of formation of the f
ive hydrated calcium berates were obtained. (C) 1997 Academic Press Li
mited.