What is the balanced half equation for the production of hydrogen gas?

The production of hydrogen gas in the context of a half-reaction involves the reduction of hydrogen ions (H⁺) to form molecular hydrogen (H₂). In the balanced half equation for this process, two hydrogen ions each gain one electron to form one molecule of hydrogen gas.

The correct half-equation, which is chosen here, reflects the correct stoichiometry and charge balance in the reaction. Specifically, two electrons are required to convert two hydrogen ions into one molecule of hydrogen gas. This ensures that both mass and charge are balanced, as the total number of hydrogen atoms on the reactant side matches that on the product side, and the total charge remains neutral.

Other choices do not fit this criteria correctly. Some suggest incorrect electron involvement or incorrect quantities, which would not depict the actual physical processes correctly in producing hydrogen gas from hydrogen ions.