Solubility

• After setting up the equation, can solve for S:

  For Fe(OH)3, (S)(3S)3 = 1.1 x 10-36
  
  27S4 = 1.1 x 10-36
  S4 = 4.07 x 10-38
  S = 4.49 x 10-10 M
  [Fe3+] = 4.49 x 10-10 M
  [OH-] = 3 x 4.49 x 10-10 = 1.35 x 10-9
  [Fe3+][OH -]3 = (4.49 x 10-10 )(1.35 x 10-9)3
  = 1.1 x 10-36 = Ksp

• If S is known, can reverse this procedure and calculate Ksp.

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