Using a single-dewar isoperibol solution calorimeter, the integral enthalpy of solution at 25 degrees C of lead nitrate was determined as 33.76+/-0.13 kJ mol(-1). Using a method developed in this laboratory, known as the dynamic precipitation method, the differential enthalpy of solution was determined as 25.83 kJ mol(-1). Using a novel NMR spectroscopic technique based on the ion activity correction method, this non-ideal figure was corrected to give an enthalpy of solution of 34.48 kJ mol(-1).