A comprehensive thermodynamic model was elaborated for lead nitrate aqueous solution using the Pitzer framework. The evaluation of the ion interaction parameters for the Pitzer model was carried out using the osmotic coefficient of lead nitrate aqueous solutions collected from the open literature at 298.15 K and also saturated vapor pressure from 283.15 to 373.15 K. A temperature dependency form of Pitzer parameters was selected after several tests of different Pitzer parameter sets. The chosen set of parameters was able to cover wider temperature ranges and consequently calculate system properties from dilution to saturation in the temperature range of 273.15-373.15 K. An equation for the solubility product for lead nitrate was also proposed, leading to the prediction of solubility data for this system. The temperature dependency of the Pitzer model shows a satisfactory behavior, giving the possibility of using the model to predict the thermodynamic properties. The extrapolation capacity of the model was also tested at temperature above 373.15 K.