The (p,rho,T) measurements and visual observations of the meniscus for {xCO(2) + (1 - x)CHF3} with x = (1.0000, 0.7496, 0.5013, and 0.2522) were carried out carefully in the critical region by a metal-bellows volumometer with optical cell. The critical properties of T-c, rho(c), and p(c) measured for pure CO2 were compared with values given in the literature and the results confirmed the capability of the apparatus. The critical parameters of T-c, rho(c), and p(c) for the mixtures measured, based on the results for observation of the critical opalescence, are presented. The composition dependence of these critical properties is compared with that predicted by cubic equations of state.