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 ((H₂O)₂BTO) and disodium 5,5′-Bistetrazole-1,1′-diolate ([Na₂(H₂O)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_dissH), relative partial molar enthalpies (Δ_dissH_partial), and relative apparent molar enthalpies (Δ_dissH_apparent) were deduced by the experimental results of the dissolution processes of (H₂O)₂BTO and [Na₂(H₂O)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 (H₂O)₂BTO in DMSO, and dα/dt = 10^−2.69(1−α)^0.62 for the dissolution of [Na₂(H₂O)₄]BTO in DMSO.