Sometimes solubility can be increased by removing a ion in solution by adding a

Question

Sometimes solubility can be increased by removing a ion in solution by adding a reactant to combine with one of the ions formed. Consider an aqueous mixture made by adding 0.0001 mole of Fe(OH)3 (solid) to 1 Liter of water. Most of the solid did not dissolve because the Ksp of ferric hydroxide is very small at 3 x 10^-39. However, when a certain amount of strong acid was added, the entire amount of solid dissolved. Determine the pH of the solution at that point that the entire iron (III) hydroxide dissolved.



a. 1.93

b. 2.17

c. 2.25

d. 2.37

e. 2.49

Explanation / Answer

3 x 10^-39 = (0.0001) (0.0001+x)^3 Hence, d. 2.37

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