Understanding Coupled Redox Reactions (10.8) from ACS Freeman Chemistry Book

[alexio]

I have studied chemistry thorugh ACS chemistry book published by Freeman.

Now I am studying chapter 10, Reduction-Oxidation and I have some problem with

Coupled Redox Reactions, 10.8.

I couldn`t understand the meaning of coupled reaction.

When I found the definition of it, it made me confused.

Plz tell me what the definition of it is and why it is important.

thanks

 

[Kushal]

if I'm not wrong, coupled redox reactions are when half cells are combined. it falls into electro chemistry and redox potentials.

eg, a hydrogen half cell is:

2H+(aq) + 2e- <-------> H2(g)

and a copper half cell is:

Cu2+(aq) + 2e- <-------> Cu(s)

when you combine both half cells,

H2(g) + Cu2+(aq) -------> 2H+(aq) + Cu(s)

this above reaction should be a coupled redox reaction.