| Abstrakt: |
The value for the enthalpy of solution of SRM 1655 (KCl), Δ H °(500 H 2 O, 298.15 K) = (235.86±0.23)J·g -1 or (17.584±0.017)kJ·mol -1 , was obtained from measurements in an adiabatic calorimeter, and confirmed by measurements in an isoperibol calorimeter. Enthalpy of solution measurements are reported in the temperature range 296 K to 358 K, at molalities between 0.005 and 0.18 mol-kg -1 , for various ranges of particle size up to 1000 μ m, and in CO 2 - saturated solutions. Observations were also made relative to the hygroscopicity, removal of occluded H 2 O, and homogeneity of SRM 1655. Between 296 K and 303 K, Δ C p =-(2.076±0.087) J·g -1 ·K -1 or -(154.8±6.4) J·mol -1 ·K -1 for the reaction of SRM 1655 in 500 H 2 O. |
