Bigger or Smaller Acidity Constant in Cations?

Acidity
Basicity
The Conjugate Seesaw

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Silvino Jimenez 1A
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

Bigger or Smaller Acidity Constant in Cations?

Postby Silvino Jimenez 1A » Sat Dec 09, 2017 7:00 pm

Hi


Would you expect Ka (Acidity Constant) of

[Fe(H20)6]^2+


to be bigger or smaller than


[Fe(H20)6]^3+

?


I understand that the iron cation w 3+ has a higher positive charge. What does that tell us about Ka?



Ty!

Curtis Tam 1J
Posts: 105
Joined: Thu Jul 13, 2017 3:00 am

Re: Bigger or Smaller Acidity Constant in Cations?

Postby Curtis Tam 1J » Sat Dec 09, 2017 7:09 pm

Ka would be smaller. The smaller 2+ charge yields less interaction with the oxygen lone pair so the resulting conjugate base would be less stable than that of [Fe(H2O)6]3+

Hope that answers your question :)


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