Adding H20 AND H+

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E_Villavicencio 2N
Posts: 26
Joined: Wed Sep 21, 2016 2:59 pm

Adding H20 AND H+

Postby E_Villavicencio 2N » Sun Feb 12, 2017 10:03 am

When balancing some reactions, sometimes water or hydrogen is added to one of the half reactions. Can somebody explain when you add each of those?

Preston_Dang_1B
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

Re: Adding H20 AND H+

Postby Preston_Dang_1B » Sun Feb 12, 2017 10:35 am

You add H2O molecules to a half reaction to help balance out the number of oxygens each side of the reaction has. Similarly, you would add H+ ions to help balance out the number of hydrogens there are on each side of the equation.

Hope this helps!

DBaquero
Posts: 13
Joined: Wed Sep 21, 2016 2:59 pm
Been upvoted: 1 time

Re: Adding H20 AND H+

Postby DBaquero » Sun Feb 12, 2017 5:47 pm

Also, it should probably be noted that you have to add only H+ and H2O for balancing redox reactions in acidic solutions. If the solution is basic then once you are done adding the H+ and H2O like before, you have to add OH- to both sides to balance out the H+, then you combine the H+ and OH- on the same side of the reaction to make H2O. Finally, you cancel out the H2O on opposite sides.
Hope that wasn't too confusing.

204863791
Posts: 9
Joined: Fri Jun 17, 2016 11:28 am

Re: Adding H20 AND H+

Postby 204863791 » Sun Feb 12, 2017 7:05 pm

When balancing our redox reaction (by adding H2O, H+, and OH-) can we use the couple H2O/H+ for reactions in an acidic and basic solution both or do we have to use OH- instead of H+ when working with a chemical reaction done in a basic solution?


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