Order to balance

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Ashley Kenney 1E
Posts: 32
Joined: Wed Nov 14, 2018 12:23 am

Order to balance

Postby Ashley Kenney 1E » Sun Feb 24, 2019 5:34 pm

When balancing half reactions, should we balance the electrons or the moles first? Also, we do we multiply the number of electrons by a stoichiometric coefficient?

Rami_Z_AbuQubo_2K
Posts: 89
Joined: Thu Jun 07, 2018 3:00 am

Re: Order to balance

Postby Rami_Z_AbuQubo_2K » Sun Feb 24, 2019 5:58 pm

When balancing reactions, you:
1. Balance the elements
2. balance the O
3. Balance the H
4. Balance the electrons

Alexandra Albers 1D
Posts: 61
Joined: Fri Sep 28, 2018 12:18 am

Re: Order to balance

Postby Alexandra Albers 1D » Sun Feb 24, 2019 6:35 pm

Electrons should be balanced after all elements have been balanced. The number of electrons in each half-reaction should be equal, so if they are not equal, multiply the equations by a coefficient to make them so.

Jonas Talandis
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Order to balance

Postby Jonas Talandis » Sun Feb 24, 2019 6:39 pm

Once the elements are balanced, it will be clear how many electrons are involved in the appropriate half reactions.

RachelCheung1A
Posts: 30
Joined: Fri Sep 28, 2018 12:19 am

Re: Order to balance

Postby RachelCheung1A » Sun Feb 24, 2019 6:49 pm

In half reactions, balance elements first, H and O second, electric charges third and then electrons last.

Mercan Bayazit 4E
Posts: 18
Joined: Fri Sep 28, 2018 12:20 am

Re: Order to balance

Postby Mercan Bayazit 4E » Sun Feb 24, 2019 7:03 pm

First you need to balance elements, then O and H and then finally the electrons.

Carlos De La Torre 2L
Posts: 60
Joined: Tue Oct 09, 2018 12:16 am

Re: Order to balance

Postby Carlos De La Torre 2L » Sun Feb 24, 2019 7:22 pm

You follow the order in the previous posts but you don't balance electrons. Electrons are used to balance the charge of the reaction. Electrons are then balanced (by multiplying either the reduction or oxidation reaction) so that they cancel out in the redox reaction to show the transfer of electrons & ensure elements, charges, and electrons are balanced.


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