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## anonymous one year ago Which equation represents the reduction half-reaction for this redox equation? Mg + CuSO4 MgSO4 + Cu A. Cu Cu B. Cu + 2e- Cu C. Cu Cu + 2e- D. Cu + 3e- Cu

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1. anonymous

@Abhisar

2. Abhisar

Ok, what do you think it should be? Any Idea?

3. anonymous

honestly, not a clue... This is my first time taking chemistry.. & i am LOST.

4. Abhisar

Fine, do you know what defines a reduction reaction ?

5. Abhisar

Yes/No?

6. anonymous

no.. ? but i can google it. lol

7. Abhisar

Ok, reduction reaction is when any species gains electron. The reaction which you have been given can be written as follows:- $$\sf Mg + Cu^{+2}+SO4^{-2} \rightarrow Mg^{+2}+SO4^{-2} + Cu$$

8. Abhisar

Now tell which species on the reactant side has gained electron?

9. Abhisar

Which one has =+ve charge on the left hand side but is neutral on right hand side?

10. anonymous

cu?

11. Abhisar

Yes, so we can say that the reduction half is :- $$\sf Cu^{2+} +2e^- \rightarrow Cu$$ Notice since it had 2+ charge before and neutral after that's why it must have gained 2 electrons.

12. anonymous

so the answer is B?

13. Abhisar

Isn't that obvious ? c:

14. anonymous

that's what i chose. thanks!!

15. Abhisar

You're welcome c:

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