The solubility of Ni(NO3)(2).6H(2)O in high-pressure CO2 + ethanol mixtures was measured using a high-pressure variable -volume view cell from (308.2 to 353.2 K) and up to 25.0 MPa. This compound has been used previously as a Ni precursor in metal deposition experiments using supercritical CO2. Ni(NO3)(2)center dot 6H(2)O was not soluble in pure CO2 but the addition of ethanol into the system allowed the solubilization of the hydrated salt in the mixture. Mole fraction of Ni(NO3)(2)center dot 6H(2)O varied from 1.67 X 10(-4) to 1.97 X 10(-3). At these salt concentrations, the phase diagram of the CO2 + EtOH + Ni(NO3)(2)center dot 61420 system resembled that of the CO2 + EtOH binary system and, at the studied conditions, a vapor liquid equilibrium was observed. For the higher ethanol concentrations, the bubble points closely matched those of the CO2 + EtOH system. For the lower EtOH concentrations, however, much higher solubilization pressures were required, due to the release of water molecules from the salt into the solution. Ni(NO3)(2)center dot 6H(2)O solutions were stable in high-pressure CO2 + EtOH mixtures at the studied conditions.