Question: A solution of NaF is added dropwise to a solution that is 0.0210 M in Mg2+ and 3.53e-06 Min Y3+. The Ksp of MgF2 is

A solution of NaF is added dropwise to a solution that

A solution of NaF is added dropwise to a solution that is 0.0210 M in Mg2+ and 3.53e-06 Min Y3+. The Ksp of MgF2 is 5.16e-11. The Ksp of YF3 is 8.62e-21. (a) What concentration of F is necessary to begin precipitation? (Neglect volume changes.) [F] = M. (b) Which cation precipitates first? O Mg2+ O Y3+ (c) What is the concentration of F when the second cation begins to precipitate? F M

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