Question
Asked Mar 29, 2019
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If a solution contained Fe3+ ions at a concentration of 0.1 M, what pH would have to be reached to
precipitate 99% of the Fe3+ as Fe(OH)3?
Hint: Determine [Fe3+] after precipitation and use it and the Ksp to
determine [OH-]

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Expert Answer

Step 1

The reaction of Fe(OH)3 to precipitate is given as,

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Step 2

Use the relation of solubility product constant, Ksp of Fe(OH)3 is 4 × 10-38

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Step 3

The pOH is calcu...

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