Densities and viscosities of aqueous sodium nitrate and sodium thiosulphate solutions were measured as functions of temperature (similar or equal to 288.0-328.4 K) and concentration (from dilute to almost saturation point). The temperature dependence of the viscosity has been analysed using the Vogel-Tammann-Fulcher equation. The concentration dependence of the viscosity has been described using a three-parameter isothermal equation.