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

For this problem, we’re being asked to calculate the concentration of Fe2+ needed in order to precipitate Fe(OH)2 from a buffer solution with pH 9.99.


Since the compound is an ionic compound, it forms ions when dissociating in water. The dissociation of Fe(OH)2 in water is:


The hydroxide ion, OH, has a charge of –1. Iron (Fe) then has a charge of +2:

Fe(OH)2Fe2+(aq) + 2 OH(aq)


97% (485 ratings)
View Complete Written Solution
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.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Ksp concept. You can view video lessons to learn Ksp. Or if you need more Ksp practice, you can also practice Ksp practice problems.