Ionic EquilibriumHard
Question
What is the minimum pH when Fe(OH)3 starts precipitating from a solution containing 0.1M FeCl3? Ksp of Fe(OH)3 = 8 × 10-13 M3
Options
A.3.7
B.5.7
C.10.3
D.8.3
Solution
[Fe3+] [OH-]3 ≥ Ksp
[OH-] ≥ 3.7 ⇒ pOH ≤ 3.7 ⇒ pH ≥ 10.3.
[OH-] ≥ 3.7 ⇒ pOH ≤ 3.7 ⇒ pH ≥ 10.3.
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