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aqua = (OH2) or (H20)

Posted: Wed Nov 29, 2017 11:54 pm
by Michele Shi 1K
When naming [Co(CN)5(OH2)], why is OH2 (aqua) written like that? (Aquapentacyanocobaltate(III))
There was another problem where you write the compound given the name "tetraamminediaquacobalt (III)bromide". The answer had aqua written like (H20)2..

Re: aqua = (OH2) or (H20)

Posted: Thu Nov 30, 2017 12:02 am
by Nehal Banik
This is because when you write out the chemical name, the Oxygen in water is supposed to be bonding to the central atom, and it is therefore meant to be written as (OH2), however since the ammonium is placed first when naming the compound, the ammonium attaches to the central atomic, but in most cases it is written as (OH2).

Re: aqua = (OH2) or (H20)

Posted: Thu Nov 30, 2017 12:22 am
by Lily Guo 1D
OH2 is written with the O first because the O is the atom with which bonds are formed.