Solids and liquids are not included in equilibrium expressions, so the Ksp expression for Fe(OH)2 is:
The concentration of OH- ions can be calculated using the pH of buffer.
The relation between pH and pOH is:
pOH = 4.01
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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