The standard enthalpy of formation of K2[NiF6](cr)

The enthalpies of interactions of K2[NiF6](cr) with water and aqueous alkali, enthalpies of solution of KF(cr) in dilute aqueous solutions of NiF2 and HF, and enthalpy of mixing of solutions of NiF2 and HF were measured at 298.15 K using isothermic-shell calorimeters. Based on the data obtained and literature values, the standard enthalpy of formation of the compound was determined by two independent methods, $$ \Delta _f H_{K_2 [NiF_6 ](cr)}^ \circ $$ = −2004 ± 8 kJ/mol.