## -OH vs OH-

Anya Holbrook 1E
Posts: 91
Joined: Wed Sep 30, 2020 9:38 pm

### -OH vs OH-

This doesn't really have anything to do with calculating pH, but why is it that sometimes in Dr. Lavelle's notes he put -OH instead of OH-? Don't charges on a molecule or ion go after the naming?

Evie Li_1H
Posts: 95
Joined: Wed Sep 30, 2020 9:48 pm
Been upvoted: 1 time

### Re: -OH vs OH-

I don't think it's that big of a deal whichever side you decide to put the charge on but, traditionally, the charge will come after the ion.

IshanModiDis2L
Posts: 84
Joined: Wed Sep 30, 2020 9:49 pm

### Re: -OH vs OH-

I believe the charge usually will come after the ion but I do not think it rly does matter too much. Only time I would really consider it is when drawing a structure.

JaylinWangDis1L
Posts: 91
Joined: Wed Sep 30, 2020 10:09 pm

### Re: -OH vs OH-

I was also a little confused on this at first but I think the placement of the negative sign doesn't really matter. It's usually written after the ion.

Cooper_Geralds_3B
Posts: 97
Joined: Wed Sep 30, 2020 10:07 pm

### Re: -OH vs OH-

Hi, I noticed the -OH in today's lecture as well and am used to seeing OH- in both his lectures and the homework, but I am pretty certain that they are the same!

Ryan_Page_1J
Posts: 86
Joined: Wed Sep 30, 2020 10:03 pm
Been upvoted: 1 time

### Re: -OH vs OH-

I have noticed that he uses them interchangeably as well.

505352202
Posts: 60
Joined: Wed Sep 30, 2020 10:06 pm
Been upvoted: 1 time

### Re: -OH vs OH-

It does not really matter. When he puts the - before like -OH, he is trying to emphasize that the oxygen is the atom with the negative charge and not the hydrogen.

I hope this helps!

apurva-3E
Posts: 135
Joined: Wed Sep 30, 2020 9:59 pm

### Re: -OH vs OH-

I don't think it matters.

Brian Bui 3H
Posts: 91
Joined: Wed Sep 30, 2020 9:42 pm

### Re: -OH vs OH-

Does not matter, but I think that he puts the negative charge on the O because that O has a formal charge of -1, which is typically indicated with just a negative sign.

SamayaJoshi1A
Posts: 93
Joined: Wed Sep 30, 2020 9:37 pm

### Re: -OH vs OH-

-OH and OH- are the same thing!

Isabel_Eslabon_2G
Posts: 89
Joined: Wed Sep 30, 2020 9:50 pm

### Re: -OH vs OH-

It's the same thing. In general, $OH^{^{-}}$ is how you'd normally write it when writing a chemical equation. $^{-}OH$ is used more when writing diagrams or mechanisms to emphasize that the negative charge is from the oxygen, not the hydrogen.

DPatel_2L
Posts: 70
Joined: Wed Sep 30, 2020 9:41 pm

### Re: -OH vs OH-

They are the same thing!

Linette Choi 3L
Posts: 88
Joined: Wed Sep 30, 2020 9:51 pm

### Re: -OH vs OH-

I believe (OH-) is used more often but I think they mean the same thing.

Katelynn Shaheen 2C
Posts: 41
Joined: Tue Nov 05, 2019 12:18 am

### Re: -OH vs OH-

It doesn't matter, -OH and OH- are the same thing in his lectures.