DETERMINE THE SOLUBILITY PRODUCT CONSTANT (and can you recommend a good Ksp tabl

Question

DETERMINE THE SOLUBILITY PRODUCT CONSTANT (and can you recommend a good Ksp table? Thanks very much!):

a) A student measures the molar solubility of iron(III) hydroxide in a water solution to be 2.17×10-10 M.
Based on her data, the solubility product constant for this compound is ___________

b) A student measures the SO42- concentration in a saturated aqueous solution of silver sulfate to be 1.66×10-2 M.
Based on her data, the solubility product constant for silver sulfate is ____________

c) A student measures the molar solubility of lead fluoride in a water solution to be 2.13×10-3 M.
Based on her data, the solubility product constant for this compound is ___________

Explanation / Answer

a) Fe(OH)2 ----> Fe2+ + 2 OH-

the solubility product constant is given by Ksp = [Fe2+] [OH-]2

let the molar solubility be s then [Fe2+] = s [OH-] = 2s

now Ksp = [Fe2+] [OH-]2

Ksp = [s]*[2s]2

Ksp = 4*s3 = 4 *(2.17*10-10M)2 = 4.087*10-29 M3

Based on her data, the solubility product constant for this compound is 4.087*10-29 M3

b) Ag2(SO)4 ----> 2Ag+ + SO42-

the solubility product constant is given by Ksp = [Ag2+]2 [SO42-]

let the molar solubility be s then [Ag2+] = 2s [SO42-] = s

[Ag2+] = [SO42-]

now Ksp = [Ag2+]2 [SO42-]

Ksp = [2s]2*[s]

Ksp = 4*s3 = 4 *(1.66*10-2M)3 = 1.829*10-5 M3

Based on her data, the solubility product constant for this compound is 1.829*10-5 M3

c) PbF2 ----> Pb2+ + 2 F-

the solubility product constant is given by Ksp = [Pb2+] [F-]2

let the molar solubility be s then [Pb2+] = s [F-] = 2s

now Ksp = [Pb2+][F-]2

Ksp = [s]*[2s]2

Ksp = 4*s3 = 4 *(2.13*10-3M)3 = 3.865*10-8 M3

Based on her data, the solubility product constant for this compound is 3.865*10-8 M3

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