H2O vs OH2

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Petrina Kan 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

H2O vs OH2

Postby Petrina Kan 2I » Tue Nov 26, 2019 2:46 am

I have noticed that in the answer key, the answers for aqua are sometimes written as H2O and sometimes they are written as OH2 to emphasize that the oxygen is attached to the metal atom. Is there a way to know which one to use when writing the formula for a coordination compound? Thank you!

Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

Re: H2O vs OH2

Postby Rita Chen 1B » Tue Nov 26, 2019 8:16 am

I think you write OH2 to emphasize that it is not bound to the hydrogen, but to the metal of the ligand. I think either is fine, but if you wanted to emphasize the coordination compound it would be OH2.

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: H2O vs OH2

Postby Sartaj Bal 1J » Tue Nov 26, 2019 10:47 am

OH2 is used to emphasize that a lone pair from the oxygen is bound to the central metal atom. Usually, OH2 is on the right side of the molecule while H2O is located on the left side on the molecule since Oxygen is closest to the central metal atom with this specific configuration.

Lizette Noriega 1H
Posts: 105
Joined: Wed Sep 18, 2019 12:15 am

Re: H2O vs OH2

Postby Lizette Noriega 1H » Tue Nov 26, 2019 11:19 am

They are interchangeable terms but using one over the other is to indicate the presence of the lone pair on the oxygen. Usually, H2O is written on the left and OH2 is on the right in order to accommodate for the bond that exists between the lone pair of the oxygen and the ligand/central atom


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