Ksp Question

[1070752]

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So I'm going over this reaction:

Zn(OH)2 + 2OH^- <---> Zn(OH)4^2-

I missed out on the notes a bit, so I have Keq = Ksp*β4 = 2.3 x 10^-2

Now, I'm lost as to what β4 stands for (and its value)... I'm guessing β4 relates to Zn(OH)4

Then this is on the notes as well:

If someone can clarify this, I would appreciate it!

 

[DaAlienist]

So I'm going over this reaction:

Zn(OH)2 + 2OH^- <---> Zn(OH)4^2-

I missed out on the notes a bit, so I have Keq = Ksp*β4 = 2.3 x 10^-2

Now, I'm lost as to what β4 stands for (and its value)... I'm guessing β4 relates to Zn(OH)4

Then this is on the notes as well:

View attachment 210305

If someone can clarify this, I would appreciate it!

I have never seen this relationship between Keq and Ksp, I thought Ksp IS the Keq for dissolving reactions, that is it is a ratio of products : reactants. Does this come from an MCAT question? Is this common on the exam?