Question

At a certain temperature* (probably not 25 ºC), the solubility of silver sulfate, Ag2SO4, is 0.025 mol/L. Calculate its solubility product constant for this temperature. SIG. FIG. (required because number is small)

*Solubility product constants are very temperature sensitive. They are generally reported at 25 ºC. Not necessarily using this temperature allows me some flexibility.

Answer 1

Ag2SO4    ---->     2 Ag+     +          SO42-  
                     2s                 s       

At equilibrium:
Ksp = [Ag+]^2[SO42-]
Ksp = (2s)^2*(s)
Ksp = 4(s)^3
Ksp = 4(2.5*10^-2)^3
Ksp = 6.3*10^-5

Answer: 6.3*10^-5