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When I was looking through the solution manual, I noticed that water was often written as OH2 instead of H2O in the formulas of coordination compounds. Can someone explain why this is the case? Will we be penalized on an exam if we write it one way as opposed to the other? Thank you so much!
Its written as OH2 because depending on the location of the molecule when it is acting as a ligand, the position of the water molecule changes. When a water molecule is a ligand on the right side of the central transition metal atom, the O is what bonds to the central atom, not the H2. Therefore, when drawing lewis structures, the O is written before the H2. ie [SnCl4(OH2)2]
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