Chemical Bonding: NaOH Explained

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Discussion Overview

The discussion centers around the nature of the hydroxide ion (OH-) in the context of sodium hydroxide (NaOH). Participants explore the charge of the OH group, its classification as a molecule or radical, and its stability in different conditions.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants assert that the OH group carries a negative charge due to an unpaired electron on the oxygen atom, leading to the classification of OH- as a radical rather than a neutral molecule.
  • Others question the definition of a molecule, suggesting that it must be electrically neutral, which leads to confusion about the nature of OH-.
  • One participant mentions that the hydroxide ion is stable and can exist freely under certain conditions, such as in aqueous solutions, but emphasizes that this does not qualify it as a molecule.
  • There is a request for clarification on the distinction between molecules and ions, particularly regarding the stability and existence of OH-.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether OH- should be classified as a molecule or a radical. There are competing views regarding the definitions and characteristics of these terms.

Contextual Notes

Some participants express uncertainty about the definitions of molecules and radicals, and there are references to the conditions under which the hydroxide ion is stable, indicating a need for further exploration of these concepts.

Who May Find This Useful

This discussion may be of interest to students learning about chemical bonding, particularly those exploring the nature of ions and radicals in chemistry.

danne89
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Hi!
In a molecule, let's say NaOH, the Na is a positive ion and the OH a negative one. How can a molecule, OH, be negative. The binding between the O and the hydrogen is, I think, colvalent. But doesn't that mean that the OH-group is charged? And how can that group binds to the other and be NaOH?
 
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danne89 said:
Hi!
In a molecule, let's say NaOH, the Na is a positive ion and the OH a negative one. How can a molecule, OH, be negative. The binding between the O and the hydrogen is, I think, colvalent. But doesn't that mean that the OH-group is charged? And how can that group binds to the other and be NaOH?

It is negative souly to the fact that one of the unpaired electrons from the oxygen atom is not hooked up in any bond.The other one is hooked up with the electron from the H atom in a covalent bond.
So basically,OH has an unpaired electron,which means a "-" net charge.What u call "molecule",is actually a radical,molecules,IIRC are electrically neutral...

Daniel.
 
Can you develop your last sentence; I don't get it, maybe because me English sucks.

This's kind of new to me. Can you redirect me to a good website (yes, I've checed the Chemestry Napster).
 
He is saying that [itex]OH^-[/itex] is not a molecule. To be a molecule, it has to be electrically neutral.
 
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What's it then. My teacher's saying it's stable and can exist freely.
 
If I am correct, it would be a negative ion.

The Bob (2004 ©)
 
danne89 said:
What's it then. My teacher's saying it's stable and can exist freely.

It is stable, and can exist freely (under certain conditions - such as in an equeous solution). But that doesn't make it a molecule. To be a molecule, it must be neutral.

It is referred to as a 'radical' or ion. In this case, it is a negatively charged radical, with 1 excess electron.
 
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