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11 Dec 2019

A solution of NaOH is added dropwise to a solution that is 0.0850 M in Fe2+ and 5.33e-11 M in Ga3+.

The Ksp of Fe(OH)2 is 4.87e-17.
The Ksp of Ga(OH)3 is 7.28e-36.




(a) What concentration of OH- is necessary to begin precipitation? (Neglect volume changes.)

[OH-] = M.



(b) Which cation precipitates first?
Fe2+Ga3+




(c) What is the concentration of OH- when the second cation begins to precipitate?

[OH-] = M.

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