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Hydroxide Ion

by andyrk
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andyrk
#1
Nov12-13, 11:23 AM
P: 235
Why does the hydroxide ion have a negative charge? , i.e OH-?
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DrDu
#2
Nov12-13, 12:00 PM
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Because if not, it would be a hydroxide radical and not an ion?
ArielRodriguez
#3
Nov23-13, 05:19 PM
P: 6
Think octet rule and lewis dot structures... you need one more electron to make the oxygen stable, so it has a 1- charge.

adjacent
#4
Nov26-13, 10:21 AM
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Hydroxide Ion

Quote Quote by andyrk View Post
Why does the hydroxide ion have a negative charge? , i.e OH-?
The simplest way for explaining this is this:
O2-+H+=(OH)- (It's actually (OH)-)

This is not stable(Stable form is H2O)

Here H+ Cancels out one electron of O2-

So one electron is left.Therefore it is left with a negative charge
-2+1=-1
Enigman
#5
Nov26-13, 11:00 AM
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Quote Quote by andyrk View Post
Why does the hydroxide ion have a negative charge? , i.e OH-?
Count the number of protons and number of electron in the ion.
With reference to what Drdu said: ions are charged, radicals are neutral.
chemistry sometimes overcomplicates things to simplify them...
Yanick
#6
Nov26-13, 12:30 PM
P: 382
Quote Quote by Enigman View Post
Count the number of protons and number of electron in the ion.
With reference to what Drdu said: ions are charged, radicals are neutral.
chemistry sometimes overcomplicates things to simplify them...
Radicals need not always be neutral.

See: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2644638/

Also you can have stuff like the superoxide anion which is a anion radical. See: http://en.wikipedia.org/wiki/Superoxide

Plenty of examples around, these are just off the top of my head.
Enigman
#7
Nov26-13, 12:51 PM
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Quote Quote by Yanick View Post
Radicals need not always be neutral.

See: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2644638/

Also you can have stuff like the superoxide anion which is a anion radical. See: http://en.wikipedia.org/wiki/Superoxide

Plenty of examples around, these are just off the top of my head.
Sorry for not being clearer, I was talking about hydroxyl radicals which DrDu mentioned rather than radicals in general.
As for the definition of radical I believe the only prerequisite is having an unpaired electron/ incompletely filled valence shell and the species in question may be an atom, ion or a molecule.


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