ⓘ अर्ध-अभिक्रिया. किसी रेडॉक्स अभिक्रिया के केवल आक्सीकरण या केवल अपचयन वाली अभिक्रिया को अर्ध-अभिक्रिया कहते हैं। यह ध्यान रखने योग्य है कि आक्सीकरण या अपचयन अके ..

                                     

ⓘ अर्ध-अभिक्रिया

किसी रेडॉक्स अभिक्रिया के केवल आक्सीकरण या केवल अपचयन वाली अभिक्रिया को अर्ध-अभिक्रिया कहते हैं। यह ध्यान रखने योग्य है कि आक्सीकरण या अपचयन अकेले नहीं होते बल्कि साथ-साथ होते हैं, और इसीलिये इसे रेडॉक्स अभिक्रिया कहते हैं।

                                     

1. उदाहरण: Zn और Cu का गैलवानिक सेल

Consider the Galvanic cell shown in the image to the right: it is constructed with a piece of zinc Zn submerged in a solution of zinc sulfate ZnSO 4 and a piece of copper Cu submerged in a solution of copperII sulfate CuSO 4. The overall reaction is:

Zns + CuSO 4 aq → ZnSO 4 aq + Cus

At the Zn anode, oxidation takes place the metal loses electrons. This is represented in the following oxidation half-reaction note that the electrons are on the products side:

Zns → Zn 2+ + 2e −

At the Cu cathode, reduction takes place electrons are accepted. This is represented in the following reduction half-reaction note that the electrons are on the reactants side:

Cu 2+ + 2e − → Cus

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