Dissolution thermodynamics of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate in water at T = (298.15, 303.15, 308.15 and 313.15 K)

The enthalpies of dissolution for dihydroxylammonium 5, 5′-bistetrazole-1,1′-diolate (TKX-50) in water were measured using a C-80 Calvet microcalorimeter at four different temperatures under atmospheric pressure. Differential enthalpies (Δ_difH) and molar enthalpies (Δ_dissH) of dissolution were calculated. The corresponding kinetic equations that describe the dissolution rate at the four experimental temperatures are dα/dt = 10^−3.06(1 − α)^0.59 (T = 298.15 K), dα/dt = 10^−2.98(1 − α)^0.37 (T = 303.15 K), dα/dt = 10^−2.90(1 − α)^0.37 (T = 308.15 K), dα/dt = 10^−2.85(1 − α)^0.43 (T = 313.15 K). In addition, the determined values of the activation energy E and pre-exponential factor A for the dissolution process are 25.08 kJ mol⁻¹ and 21.98 s⁻¹, respectively.