TPR Hyperlearning Workbook Error Question

[betterfuture]

There is a particular question asking for the expression setup of Ba(OH)2 in order to find the solubility product.

Answer in book: Ksp = [Ba2+][OH-]^2

Shouldn't it be Ksp = [Ba2+][2*OH]^2 The 2 coming from the balanced equation.
BaOH2 --> Ba2+ + 2OH-

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[theonlytycrane]

The "2" goes into the power term.

http://chemwiki.ucdavis.edu/Core/Ph...ia/Solubilty/Solubility_Product_Constant,_Ksp

 

[betterfuture]

But the final expression would be something along the lines of:

Ksp = 4x^3, right?

 

[aalamruad]

But the final expression would be something along the lines of:

Ksp = 4x^3, right?

Yep, as long as you define x correctly.

 

[salemstein]

But the final expression would be something along the lines of:

Ksp = 4x^3, right?

Only if x = [Ba2+]. Keep in mind tho [OH-] is 2x

 

[betterfuture]

It is:
Ksp = [Ba2+][OH-]^2
Ksp = [x][2x]^2
Ksp = x*4x^2
Ksp = 4x^3