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

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+2 votes
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asked Feb 25, 2018 in Chemistry by meghna katoch (25 points) ● 1
edited Feb 25, 2018 by Annu Priya

1 Answer

+1 vote
answered Feb 25, 2018 by Annu Priya (18,055 points) ● 24 ● 45 ● 82

 [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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