The following reaction occurs in pure water: H₂O(l) + H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq), which is often written as H₂O(l) ⇄ H⁺(aq) + OH⁻(aq) and has a value of ΔG° = 79.9 kJ/mol. What is the complete equation for the reaction in pure water?