The molar enthalpies of solution, Delta H-sol(m)(wc), of 1-ethyl-3-methylimidazolium ammonioacetate (EMIGly) with various amounts of water and with various molalities were measured by the solution-reaction isoperibol calorimeter at (298.15 +/- 0.01) K. According to Archer's method, the standard molar enthalpis of solution of EMIGly with a known amount of water, Delta H-sol(m)0(wc), were obtained. In order to eliminate the effect of the small amount of water in EMIGly, a linear fitting of Delta H-sol(m)0(wc) against water content was carried out so that a good straight line was obtained, and the intercept was the standard molar enthalpy of solution, Delta H-sol(m)0 (pure IL EMIGly) = (- 34.6 +/- 0.5) kJ.mol(-1). Using Glasser's theory of lattice energy, the hydration enthalpy of the anion of glycine was estimated.