For a good design of all the processes in Carbon Capture and Storage, the thermodynamics of the CO2 and CO2 mixtures should be accurately predicted. Among these mixtures are CO2-water systems that are very difficult to deal with due to the polar nature. In this work we suggest a new extended corresponding states equation of state (EoS) that can handle polar mixtures. The new EoS uses the Bender Modified Benedict-Webb-Rubin EoS as a reference equation. NH3, R23 and R503 are used as reference fluids with parameters from Polt. The EoS presented uses the Soave-Redlich-Kwong EoS with Huron Vidal mixing rules based approach to compute the scale factors. The evaluation of the new EoS is done over a large set of experimental data. The results show very high accuracy in predicting both phase equilibrium and densities. (C) 2015 Elsevier Ltd. All rights reserved.