what is the conjugate base of Al( H2O )6 +3

Monjur Alahi

what is the conjugate base of Al( H2O )6 +3


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Salim Ahmed Kawsar

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 [Al(H2O)6]3+ + H2O ⇋ [Al(H2O)5(OH)]2+ + H3O+ 
Ka ~10-5 [1] cf acetic acid 
The OH- is bound as a ligand to the Al3+ cation thus the complex has an overall charge of 2+. 
So, The conjugate base is [Al(H2O)5(OH)]2+ 

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