What happens during the removal of hydrogen ions at the cathode?

During the removal of hydrogen ions at the cathode, the main chemical reaction involves the reduction of these ions to form hydrogen gas or hydroxyl ions, depending on the context and the type of reaction occurring. In the case where hydroxyl ions are produced, this means that as hydrogen ions (H+) gain electrons (reduction), they can indeed convert to hydroxyl ions (OH^-), typically in an alkaline medium.

This process contributes to an increase in the concentration of hydroxyl ions in the vicinity of the cathode. A higher concentration of hydroxyl ions can lead to an increase in the pH level of the solution, making the environment more alkaline rather than acidic. Thus, the removal of hydrogen ions directly relates to the formation of hydroxyl ions, supporting the selection of this answer as the correct response.

Understanding this concept is key in cathodic protection systems, where reducing local acidity at the cathode can help mitigate the corrosion process, enhancing the protective effects of the cathodic protection system.