Why do the bubbles from the antacid tablet move toward the surface of the water?

The bubbles from the antacid tablet move toward the surface of the water due to buoyancy. As the tablet dissolves, it releases carbon dioxide gas, which forms bubbles that are less dense than the surrounding liquid. This difference in density causes the bubbles to rise, as they seek to escape the liquid and reach the air above. Additionally, the upward movement is aided by the surface tension of the water, which helps the bubbles break through the surface.