Topscore Chem Q

[Aschematic]

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Sorry. This may be an obvious question but I am wondering where that "4" in choice (a) came from. 😀 Thanks. (The correct choice is A.)

 

[Evergrey]

The wikipedia page on solubility equilibrium has that problem almost verbatim under "ionic compounds". Basically you use the Ksp value to convert to molar solubility, solve for x, and x is how much of the component is dissolved.

 

[wantVCUdental]

Sorry. This may be an obvious question but I am wondering where that "4" in choice (a) came from. 😀 Thanks. (The correct choice is A.)

Cmon, a canadian student shouldn't be asking trivial questions like these 😀.

BaF2-> Ba +2F
x 2x

Ksp=x(2x)^2
Ksp=4x^3

That's where the 4 came from 😀
good luck

 

[Aschematic]

Thanks. Totally forgot about the "2" as coefficient.