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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!
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.
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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