Question

What is the Ksp and Kf of `Zn(H_2O)_6` ?

Answer 1

Well `K_"sp"` is unknown..........

Explanation:

I think you refer to the zinc ion in water, which we should represent as `[Zn(OH_2)_6]^(2+)`. Salts such as `ZnCl_2` are mighty soluble in water (you'll have to dig for the details), but if we represent its solubility as `S`,

then according to the solubility equation:

`ZnCl_2(s) + "excess"H_2OrightleftharpoonsZn^(2+)+2Cl^(-)`

And so `K_"sp"=[Zn^(2+)][Cl^-]^2`

And reasonably, we can equate the solubility of the salt, `S`, with `[Zn^(2+)]`. Do you agree?

And so, finally, we write, `K_"sp"=Sxx(2S)^2=4S^3`.

`K_"f"(Zn^(2+)(aq))` is a trickier proposition.