Experimental and predicted refractive index properties in ternary mixtures of associated liquids

► Measurements of refractive indices of 200 different aqueous ternary mixtures have been performed for two wave lengths. ► Refractive indices of the associated ternary mixtures can be modeled with a relative error of about 0.9. ► Difference between experimental and calculated derivatives of refractive index with concentration is unsatisfactory large.