The Fuel Cell of Hydrogen and Oxygen can take place in Acid or Alkaline Solution. In either situation we first balance the redox equations in acid solution. The product of the reaction is water. Oxidation Half Equation (Acid Solution) H₂ -----> H₂O 1. Add H₂O to balance O atoms H₂O + H₂ -----> H₂O 2. Balance H atoms with H+ H₂O + H₂ -----> H₂O + 2H ⁺ 3. Balance charge with e⁻ There is 0 charge on LHS and +2 charge on RHS so add 2e to the RHS: H₂O + H₂ ----> H₂O + 2H⁺ +