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⁺ +

One of my A Level Chemistry students successfully completing the Born Haber Cycle for Aluminium Oxide. Probably the hardest Born Haber...

Student completing Enthalpy of Solution Cycle for Magnesium Chloride... #EnthalpyOfSolution #OnlineALevelChemistryTutor...

Sulphuric Acid is reduced by Iodide ions to form Sulphur Dioxide. Iodide ions are oxidised to Iodine. Reduction Half Equation H₂SO₄ -----> SO₂ 1. Balance the species that has been oxidised or reduced. In this case the sulphur has been reduced from +6 to +4. The sulphur atoms are balanced. 2. Balance oxygen using H₂O There are 4 on LHS and 2 on RHS so add 2 H20 to the RHS H₂SO₄ ----> SO₂ + 2 H₂O 3. Balance hydrogen atoms (H+) There are 2 on LHS and 4 on RHS

If you have worked out the MOLES of two reactants then the limiting reagent is the one with less moles. Sorted? Well, it depends. If the...