The fugacities of water and carbon dioxide are calculated as a function of temperature for a closed container, which is a model of a can of soda. The concentrations of the two components are calculated in both the liquid and the gas phases. As the temperature increases, the pressure increases, and therefore the fugacities increase. Note that the CO₂ concentration is much lower than the H₂O concentration in the liquid phase, but the CO₂ concentration is much higher than the H₂O concentration in the gas phase. Because the gas phase is assumed to be ideal, the fugacities of CO₂ and H₂O in both phases are equal to their gas-phase partial pressures, and thus the CO₂ fugacity is much higher than the H₂O fugacity. As the temperature increases, the CO₂ concentration in liquid water decreases. However, as the temperature increases, the pressure increases, and a higher CO₂ pressure increases the CO₂ concentration in water, so the net effect is that the concentration in the liquid phase does not change much as the temperature increases.

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This simulation was made at the University of Colorado Boulder, Department of Chemical and Biological Engineering.  Author: Rachael L. Baumann

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