Wednesday
April 16, 2014

Homework Help: Chemistry

Posted by a Canadian on Monday, April 8, 2013 at 8:41pm.

The Ksp for nickel(II) hydroxide is 5.47E-16. What is the base dissociation constant for nickel(II) hydroxide?
So I started off doing
Ni(OH)2 (s) <-> Ni2+ (aq) + 2OH- (aq)
I ..........................0 .................0
C ........................+x ................+2x
E ........................x ..................2x

Ksp = [Ni2+][OH-]^2
= (x)(2x)^2
= 4x^3
3sqrt 5.47E-16/4 =x
5.15E-6 = x

Wouldn't Kb just be
Kb = [Ni2+][OH-]^2 ??
And then If I solved it by subbing in x, I'd just get the Ksp value... Is Kb supposed to be the same as the Ksp value?

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