Figure 2: Changes in pH measured during gas-water-rock experiments (green triangle = pure CO2 case, red square = 0.1% SO2 case, and blue rhombus = 1% SO2 case) and changes in pH in the modeling (green dashed line = pure CO2 case, red dashed line = 0.1% SO2 case, and blue solid line = 1% SO2 case).