H+, OH-, water

[rkang00]

If there are H+ or OH- or water left over from balancing half-rxns, do we have to list them in the cell diagram as well?

[Brian Chhoy 4I]

I would think that you would need to include the H+ and OH- in the cell diagrams, but I dont think water is included.

[Danny Zhang 4L]

You will only need to include H+ and OH-.

[Zubair Ahmed 1L]

You will only need to include H+ and OH- in the cell diagram; exclude water.

[MadelynNguyen1F]

A previous chem community post stated, "it seems that the elements/molecules are included that contribute to an oxidation number change or the overall charge on a side of a reaction.
H+ and the other ions contribute to charge difference and therefore, electron balance.
The neutral NO2(g) molecule is important because it has a different oxidation number for N than NO3-(aq).
H2O doesn't really do much because it is neutral and doesn't contribute to electron balance and the oxidation number of either element doesn't change from one side of the reaction to another"

[makenzie2K]

Would we be penalized for including the presence of water in the cell diagram? If it doesn't contribute to a charge difference I don't see why we would, but I just want to make sure.

[Nicole Elhosni 2I]

You only put the elements or compounds in the cell diagram that are being oxidized or reduced. If H+ was reduced to H2, then you would put it at the cathode. But when using H+, H20, and OH- to balance redox reactions, they are not placed into the cell diagram notation.

[Katie_Duong_1D]

You include H+, OH-, and water when balancing equations, then cancel if they are on both sides. H2O is a pure liquid, so only include aqueous OH- and H+ are included.

[Krista Mercado 1B]

You would include H+ and OH-, but not H2O

[Meghanhe1l]

Water is implied in the aqueous species of your cell diagram, so you do not need to externally include them. However, the presence of H+ and OH- needs to be specified by including them in your cell diagram.