The liquid phase thermodynamic of mixing of the copper-aluminium binary system is investigated as a function of temperature and composition using the electrochemical potential difference method. A copper-selective beta" alumina (Cuβ"Al 2 O 3 ) is used as a solid electrolyte, synthesized through ion exchange, sintering from base oxide powders, and the floating zone method of crystal growth. Measured thermodynamic of mixing data were used to inform short range ordering in copper-aluminium melts through Darken's factor for excess stability and Bhatia-Thornton structure factors, revealing a strong departure from ideality and pronounced ordering. Mixing properties were used to predict viscosity and self-diffusion coefficients. Features observed in calculated electronic entropy of mixing for copper-aluminium were compared to trends in viscosity, demonstrating the utility of electronic property of mixing in the description of structure-properties in this liquid binary system.