A full-factorial designed experiment was completed to quantify the effect of temperature, wet CO2 density and brine Na-Ca-Cl salinity on the liquid-side mass transfer coefficient k(L) for the dissolution of CO2 into brine. The range of experimental conditions corresponds to those relevant to the surface dissolution approach to geologic storage of anthropogenic CO2. The measured range of k(L) was from 0.015 to 0.056 cm/s. An empirical correlation was developed for k(L) as a function of temperature to wet CO2 density and NaCl salinity. Greater temperature and smaller NaCl salinity increase k(L). There is an interaction effect between temperature and wet CO2 density, which increases or decreases k(L) depending on the value of each CaCl2 salinity does not have a statistically significant effect on k(L). Wet CO2 density was used as an independent variable, in the place of pressure, since it was found to play a critical role in the onset of gas entrainment. Geologic storage of CO2 via the surface dissolution method requires different operating conditions for different applications. Importantly, since the composition of brine varies between locations, the dependency of k(L) on NaCl salinity allows for location specific process design. (C) 2013 Elsevier Ltd. All rights reserved.