A Solution Contains F ^- and CO₃^{2 -}

question 9

Multiple Choice

A solution contains F ^- and CO₃^{2 -} both at 5.0×10 ^{- 5} M . Solid Ca(NO₃) ₂ is added slowly. At what concentration for Ca²⁺ ions does the second precipitate begin to form?
For CaF₂, K _sp = 1.7×10 ^{- 10}. For CaCO₃, K _sp = 4.7×10 ^{- 9}.

• A) 9.4×10 ^{- 5} M
• B) 6.8×10 ^{- 2} M
• C) 3.4×10 ^{- 6} M
• D) 3.6×10 ^{- 2} M
• E) 1.9 M

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