Thermochemical study on the complex of Ca(II) with ascorbic acid

The solid-solid state coord ination reaction enthalpy of CaO w ith ascorb ic ac id has been determ ined by solution calorim e-try in an isoperibel reaction calorim eter at 298.2K.The calorim ietric solvent is 2mol/L HC l.A thermochem ical cyc le has been de-signed,and the standard Enthalpy of form ation for Ca(C6H7O6)2.4H2O(s) has been calcu lated.The recomm ended values of standard enthalpy of form ationΔfHΘm[Ca(C6H7O6)2.4H2O,s] is-3941.5kJ.mol-1