Balancing Half Reactions

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Jesus Rodriguez 1J
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

Balancing Half Reactions

Postby Jesus Rodriguez 1J » Sun Feb 18, 2018 10:30 am

How do we know when to add H20 or H+ to the half reactions?
For example in 14.3 part a
They added 5H20 to the reactants and 10H+ to the products. I'm not sure where they got these numbers from.

Hazem Nasef 1I
Posts: 51
Joined: Tue Oct 10, 2017 7:13 am

Re: Balancing Half Reactions

Postby Hazem Nasef 1I » Sun Feb 18, 2018 11:29 am

When balancing half-reactions, first balance all the elements except for hydrogen and oxygen. Then, balance any oxygens by adding the appropriate number of water molecules to the side opposite of the oxygens. Then, you balance the hydrogens from the water molecules by adding H+ ions to the side opposite of the water. Finally, balance the charge by adding electrons to the appropriate side.

Sandhya Rajkumar 1C
Posts: 50
Joined: Fri Jun 23, 2017 11:40 am

Re: Balancing Half Reactions

Postby Sandhya Rajkumar 1C » Sun Feb 18, 2018 12:07 pm

Also, because the problem specifies that the reaction occurs in an acidic solution, you know to add H+ and not OH-.

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