Dissolution properties of 5,5′-bistetrazole-1, 1′-dihydroxy and disodium 5,5′-bistetrazole-1, 1′-diolate in dimethyl sulfoxide

The enthalpies of dissolution for 5,5′-Bistetrazole-1, 1′-dihydroxy ((H 2 O) 2 BTO) and disodium 5,5′-Bistetrazole-1,1′-diolate ([Na 2 (H 2 O) 4 ]BTO) in dimethyl sulfoxide (DMSO) at 298.15 K were studied by using a C-80 Calvet microcalorimeter. Empirical formulae for the calculation of the molar enthalpies of dissolution (Δ diss H ), relative partial molar enthalpies (Δ diss H partial ), and relative apparent molar enthalpies (Δ diss H apparent ) were deduced by the experimental results of the dissolution processes of (H 2 O) 2 BTO and [Na 2 (H 2 O) 4 ]BTO in DMSO. Finally, the corresponding kinetic equations describing the dissolution processes were dα/dt = 10 −2.60 (1− α ) 0.61 for the dissolution of (H 2 O) 2 BTO in DMSO, and dα/dt = 10 −2.69 (1− α ) 0.62 for the dissolution of [Na 2 (H 2 O) 4 ]BTO in DMSO.