Consider the Ksp values of the following salts and indicatewhich of these is lea

Question

Consider the Ksp values of the following salts and indicatewhich of these is least soluble in water. 1. AB2 Ksp = 1x10^-15 2. AB Ksp = 1x10^-10 3. AB3 Ksp = 1x10^-20 4. AB4 Ksp = 1x10^-25 2ND PART OF THE QUESTION IS... and What is Ksp for Ag3PO4, if its molar solubility is 2.7 x10^-6 mol/L Consider the Ksp values of the following salts and indicatewhich of these is least soluble in water. 1. AB2 Ksp = 1x10^-15 2. AB Ksp = 1x10^-10 3. AB3 Ksp = 1x10^-20 4. AB4 Ksp = 1x10^-25 2ND PART OF THE QUESTION IS... and What is Ksp for Ag3PO4, if its molar solubility is 2.7 x10^-6 mol/L

Explanation / Answer

For AB2 ,    Ksp =(s)(2s)2 = 1x10^-15                                  4s^3 = 1x10^-15                                     s = (1x10^-15/4)^(1/3)                                       = 6.29x10^-6 For AB , Ksp = (s)(s) = 1x10^-10                               s^2 = 1x10^-10                               s = 1x10^-5 For AB3 ,     Ksp =(s)(3s)^3 = 1x10^-20                                     27s^4 = 1x10^-20                                           s = 4.39x10^-6 For AB4 ,      Ksp =(s)(4s)^4 = 1x10^-25                                       256s^5 = 1x10^-25                                             s = 3.29x10^-6    (least soluble) 2. For Ag3PO4 ,    Ksp =(3s)^3(4s)^4                                       = (3x2.7 x 10^-6 mol/L)^3(4x2.7 x 10^-6 mol/L)^4                                      = 7.23x10^-36

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