Final answer:
The galvanic pole that shows the most bubbles is the cathode, where hydrogen gas is produced in a typical galvanic cell, such as one involving a standard hydrogen electrode and zinc.
Step-by-step explanation:
The galvanic pole which shows the most bubbles in water is the cathode. In a typical galvanic cell, such as the one with a standard hydrogen electrode (SHE) and a zinc electrode, hydrogen ions (H+) are reduced to form hydrogen gas (H2) at the cathode. This is where you would observe the production of bubbles when the cell operates. The presence of bubbles is due to the polarization of water molecules, making them more susceptible to the formation of hydrogen gas bubbles around the cathode where the reduction of H+ ions occurs. The production of gas bubbles is a physical indication of the chemical reaction taking place in the galvanic cell.