【Basic Knowledge 8】Cathodic depolarization reactions that occur preferentially in neutral media (prize quiz)
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Which cathodic depolarization reaction occurs preferentially in a neutral medium? Why?
Which cathodic depolarization reaction occurs preferentially in a neutral medium? Why? This is a bit tricky; looking forward to the answer.
In a neutral medium, the cathodic process mainly involves the depolarization reaction of oxygen. In acidic media, hydrogen acts as the main depolarizer, whereas in neutral and alkaline environments, oxygen is the primary agent at work. In fact, corrosion in telephones can be summarized in one word: oxygen
The cathodic depolarization reaction that occurs preferentially in a neutral medium is the reduction reaction in which dissolved oxygen accepts electrons
Correct answer: The depolarization reaction of oxygen, that is, the oxygen-consuming reaction, occurs first. Because the potential at which the oxygen-consuming reaction occurs is more positive than the potential at which the hydrogen evolution reaction occurs.