How do you calculate Ksp from solubility?

1 Answer
May 22, 2018

Answer:

Well, let us seek an example....

Explanation:

For #"lead(II) chloride"#, this site quotes a solubility of #10.8*g*L^-1# under standard condition..., and this is a molar solubility of #((10.8*g)/(278.10*g*mol^-1))/(1*L)=0.03883*mol*L^-1# so we address the equilibrium....

#PbCl_2(s) stackrel(H_2O)rightleftharpoonsPb^(2+) + 2Cl^-#

And in the standard way, we write the #"solubility expression..."#, with #S="molar solubility of lead chloride"#

#K_"sp"=[Pb^(2_+)][Cl^-]^2=Sxx(2S)^2=4xx(0.03833)^3=2.28xx10^-4# ...