Dissolution Properties of Dihydroxylammonium 5,5ʹ-Bistetrazole-1,1ʹ-diolate and Disodium 5,5ʹ-Bistetrazole-1,1ʹ-diolate in Water

The dissolution and thermochemical properties of dihydroxylammonium 5,5ʹ-bistetrazole-1,1ʹ-diolate (TKX-50) and its intermedium disodium 5,5ʹ-bistetrazole-1,1ʹ-diolate ([Na₂(H₂O)₄]BTO) in water at 298.15 K were studied 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 TKX-50 and [Na₂(H₂O)₄]BTO in water. Finally, the corresponding kinetic equations describing the dissolution processes were dα/dt = 10^−2.95(1 − α)^0.64 for the dissolution of TKX-50 in water and dα/dt = 10^−2.76(1 − α)^1.07 for the dissolution of [Na₂(H₂O)₄]BTO in water.