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MMLU-Pro / 4594 / The solubility products of Fe(OH)_2 and Fe(OH)_3 are 10-^17 and 10-^38 ,…

Problem

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question

The solubility products of Fe(OH)_2 and Fe(OH)_3 are 10-^17 and 10-^38 , respectively. If the concentrations of Fe^2+ and Fe^3+ are each 10-^5 M, at what pH will each hydroxide just begin to precipitate?

category

chemistry

options

  1. pH = 4 for Fe(OH)_2 and pH = 9 for Fe(OH)_3
  2. pH = 6 for Fe(OH)_2 and pH = 11 for Fe(OH)_3
  3. pH = 12 for Fe(OH)_2 and pH = 7 for Fe(OH)_3
  4. pH = 9 for Fe(OH)_2 and pH = 4 for Fe(OH)_3
  5. pH = 10 for Fe(OH)_2 and pH = 5 for Fe(OH)_3
  6. pH = 5 for Fe(OH)_2 and pH = 10 for Fe(OH)_3
  7. pH = 14 for both Fe(OH)_2 and Fe(OH)_3
  8. pH = 7 for Fe(OH)_2 and pH = 2 for Fe(OH)_3
  9. pH = 8 for Fe(OH)_2 and pH = 3 for Fe(OH)_3
  10. pH = 11 for Fe(OH)_2 and pH = 6 for Fe(OH)_3

src

stemez-Chemistry

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