Problem: Above what Fe2+ concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 9.99? The Ksp of Fe(OH)2 is 4.87. 

FREE Expert Solution

Solids and liquids are not included in equilibrium expressions, so the Ksp expression for Fe(OH)is:

Ksp = Fe2+OH-2

The concentration of OH- ions can be calculated using the pH of buffer.

The relation between pH and pOH is:

pH + pOH = 14


9.99 + pOH = 14pOH = 14 - 9.99

pOH = 4.01

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Problem Details

Above what Fe2+ concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 9.99? The Ksp of Fe(OH)2 is 4.87. 

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