1. **酸性电解质中的电极反应** - **正极反应**： - 当正极上的反应物质是\(O_{2}\)时，在酸性电解质溶液中，\(H^{+}\)参与反应，\(O_{2}\)得电子生成水，电极反应式为\(O_{2}+4H^{+}+4e^{-}=2H_{2}O\)。 - 对于其他在酸性电解质中的正极反应，遵循得到电子发生还原反应的原则，根据具体的反应物质确定反应式，例如在\(H_{2}SO_{4}\)溶液中\(2H^{+}+2e^{-}=H_{2}\uparrow\)。 - **负极反应**：负极失去电子发生氧化反应。例如在\(H_{2}SO_{4}\)溶液中，以\(Mg\)为负极材料时，\(Mg - 2e^{-}=Mg^{2+}\)。在书写负极反应式时要注意负极反应生成的阳离子与电解质溶液中的阴离子是否共存，如果不共存，则该电解质溶液中的阴离子应写入负极反应式。 2. **碱性电解质中的电极反应** - **正极反应**： - 当正极上的反应物质是\(O_{2}\)时，在碱性电解质溶液中，水参与反应，\(O_{2}\)得电子生成\(OH^{-}\)，电极反应式为\(O_{2}+2H_{2}O + 4e^{-}=4OH^{-}\)。 - **负极反应**：负极失去电子发生氧化反应。如以\(Al\)为负极材料，电解质为\(NaOH\)溶液时，负极反应式为\(2Al - 6e^{-}+8OH^{-}=2AlO_{2}^{-}+4H_{2}O\)。同样要注意负极反应生成的阳离子与电解质溶液中的阴离子是否共存等问题，例如在碱性条件下，钢铁腐蚀中负极生成的\(Fe^{2+}\)与溶液中的\(OH^{-}\)结合生成\(Fe(OH)_{2}\)。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>

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