September 28, 2026 at 1:04 pm #7499 Lösung: 2·H3O+ + 2·e– → H2 + 2·H2O // – 2·H+ 2·H2O + 2·e– → H2 + 2·OH– // ·2 4·H2O + 4·e– → 2·H2 + 4·OH–