Abstract
A new isothermal reaction calorimeter was designed and constructed for direct measurement of the enthalpy of hydrogen bonded complexes of hydrogen fluoride (HF) with proton acceptor in dilute solution. The enthalpy of mixing of chlorobenzene with benzene was measured at 298.15K and the formation enthalpy (ΔHc) of hydrogen bonded complex of HF with diethyl ether was also measured in cyclohexane solution at 298.15K. The performance of the calorimeter was evaluated on the basis of these results and comparisons were made with previously published data. The results obtained with the present calorimeter were internally consistent to ±0.07J for the system of chlorobenzene and benzene. The reproducibility of ΔHc of hydrogen bonded complex of HF with diethyl ether was within ±0.08kJ.
