Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (03): 467-472.doi: 10.3866/PKU.WHXB201212202

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

Solution Heat of Potassium Styphnate and Caesium Styphnate in Water and DMF at 298.15 K

LIU Ying, TONG Wen-Chao, YANG Li, ZHANG Tong-Lai, FENG Chang-Gen   

  1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2012-11-16 Revised:2012-12-17 Published:2013-02-25
  • Supported by:

    The project was supported by the Science and Technology Fund on Applied Physical Chemistry Laboratory, China (9140C3703051105, 9140C370303120C37142) and State Key Laboratory of Explosion Science and Technology, China (QNKT12-02, YBKT10-05).

Abstract:

The dissolution and thermochemical properties of potassium styphnate [K2(TNR)(H2O)]n and cesium styphnate [Cs2(TNR)(H2O)2]n in water and N,N-dimethylformamide (DMF) at 298.15 K were studied by calorimetry. The processes are endothermic in water, and exothermic in DMF because of the different molecular structure and polarity of the solutes and solvents. Empirical formulas for the solution enthalpies (ΔsolH), relative apparent molar solution enthalpies (ФLi), relative partial molar enthalpies (Li), and dilution enthalpies (ΔdilH1,2) are deduced by polynomial expressions, and standard solution enthalpies (ΔsolHmθ) are also calculated.

Key words: Dissolving process, Thermochemistry, 2,4,6-Trinitro-resorcinol, Solution enthalpy, Dilution enthalpy

MSC2000: 

  • O642