Thermochemistry of 2-Aminopyridine (C 5 H 6 N 2 )(s)

ISSN： 0095-9782

Source： Journal of Solution Chemistry, Vol.40, Iss.5, 2011-05, pp. : 900-906

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Abstract

The molar enthalpies of solution of 2-aminopyridine at various molalities were measured at T=298.15 K in double-distilled water by means of an isoperibol solution-reaction calorimeter. According to Pitzer's theory, the molar enthalpy of solution of the title compound at infinite dilution was calculated to be $Delta_{mathrm{sol}}H_{mathrm{m}}^{infty} = 14.34~mbox{kJ}cdotmbox{mol}^{-1}$ , and Pitzer's ion interaction parameters $beta_{mathrm{MX}}^{(0)L}, beta_{mathrm{MX}}^{(1)L}$ , and $C_{mathrm{MX}}^{phi L}$ were obtained. Values of the relative apparent molar enthalpies (^φ L) and relative partial molar enthalpies of the compound ( $bar{L}_{2})$ were derived from the experimental enthalpies of solution of the compound. The standard molar enthalpy of formation of the cation $mathrm{C}_{5}mathrm{H}_{7}mathrm{N}_{2}^{ +}$ in aqueous solution was calculated to be $Delta_{mathrm{f}}H_{mathrm{m}}^{mathrm{o}}(mathrm{C}_{5}mathrm{H}_{7}mathrm{N}_{2}^{+},mbox{aq})=-(2.096pm 0.801)~mbox{kJ}cdotmbox{mol}^{-1}$ .