One Liter of Solution Is Made Containing 10 ^{- 4}

question 43

Multiple Choice

One liter of solution is made containing 10 ^{- 4} moles of Mn²⁺ and 10 ^{- 5} moles of Fe²⁺. The [OH ^- ] is adjusted to 1.82×10 ^{- 4} M . Which of the following statements is true, given K _sp [Mn(OH) ₂] = 4.5×10 ^{- 14} and K _sp [Fe(OH) ₂] = 2.0×10 ^{- 15}?

• A) Both Mn and Fe will precipitate as hydroxides.
• B) Only Fe²⁺ will precipitate.
• C) Only Mn²⁺ will precipitate.
• D) Neither will precipitate.
• E) Need more information to draw a conclusion.

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