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The solubility of CO 2 in the molten Na 2 CO 3 --K 2 CO 3 eutectic mixture at 800°C has been measured using a manometric method. The corresponding Henry's constant amounts to 1.83 10 -1 moll -1 atm -1 which is a rather high value in comparison with other values reported in the literature for CO 2 in carbonate melts at lower temperature. A diffusion coefficient of 4.5 10 -5 cm 2 s -1 has been evaluated from the experimental data for CO 2 in the investigated melt. The CO 2 /CO system is electroactive but the peak current for the reduction of CO 2 appears to be low if the solubility is taken into account. An explanation is proposed which involves the production of C 2 O 2-5 ions by reaction between CO 2 and the melt.