A Solution of NaF Is Added Dropwise to a Solution $\mathrm { Ba } ^ { 2 + }$

question 152

Multiple Choice

A solution of NaF is added dropwise to a solution that is 0.0188 mol L^-1 in $\mathrm { Ba } ^ { 2 + }$ .When the concentration of $\mathrm { F } ^ { - }$ exceeds ________ mol L^-1, $\mathrm { BaF } _ { 2 }$ will precipitate.Neglect volume changes.For $\mathrm { BaF } _ { 2 }$ , $K _ { \mathrm { sp } } = 1.7 \times 10 ^ { - 6 }$

• A)9.0 × 10^-5
• B)3.2 × 10^-8
• C)4.5 × 10^-5
• D)2.4 × 10^-3
• E)9.5 × 10^-3

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