Mute
Com.Ciência.Gaia
Quando fazemos eletrólise da água pura, o esperado é: 👉 no cátodo: formação de hidrogênio (H₂) 👉 no ânodo: formação de oxigênio (O₂) Mas quando adicionamos cloreto de sódio (NaCl) à água, o comportamento muda completamente. Na solução passam a existir os íons: Na⁺ e Cl⁻, além da própria água. No cátodo, a água continua sendo reduzida: 2 H₂O + 2 e⁻ → H₂(g) + 2 OH⁻ Ou seja, ainda se forma hidrogênio gasoso (H₂). Já no ânodo, ocorre uma competição: • a água pode formar O₂ • o íon Cl⁻ pode for
Follow
6
0
2
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