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Compare the acidity of [Co(H 2 O) 6 ] 2+ and [Co(H 2 O) 6 ] 3+

Compare the acidity of [Co(H2O)6]2+ and [Co(H2O)6]3+

Grade:12th pass

1 Answers

Arun
25750 Points
4 years ago
Co2+ (having electronic configuration 3d7) has a higher Crystal Field Stabilisation Energy than Co3+ (having electronic configuration d6) .
So, in the aqueous solution , due to the weak octahedral field , Co2+(aq) has higher stability than Co3+(aq) .
Due to the presence of weak field ligament H2O,  the Co2+(aq) has higher stability than Co3+(aq) .
Due to the presence of weak field ligament H2O, there are half field shells with all the spins parallel to each other , provides the extra stability .
Thus, [co(H2O)6]+2 ion is more stable and acisic than [co(H2O)6]+3 ion .
 
 

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