A solution of Na3AsO4 is added dropwise to a solution that is 3.38e-02 M in Bi3+

Question

A solution of Na3AsO4 is added dropwise to a solution that is 3.38e-02 M in Bi3+ and 2.34e-08 M in Cd2+. The Ksp of BiAsO4 is 4.43e-10. The Ksp of Cd3(AsO4)2 is 2.2e-33.

Calculate the concentration of AsO43- present in the Bi3+/Cd2+ solution when the first (initial) cation begins to precipitate, and the concentration of AsO43- present in this solution when the second (final) cation begins to precipitate. Write down which cation precipitates first and which precipitates second (last).

Choose the correct statement from below based on your work.

a) The molarity of AsO43- which begins to precipitate the initial cation is 1.31e-08 M.

b) The molarity of AsO43- which begins to precipitate the initial cation is 2.82e-56 M.

c) The molarity of AsO43- which begins to precipitate the final cation is 6.51e-32 M.

d) The molarity of AsO43- which begins to precipitate the final cation is 3.46e+13 M.

e) The first metal cation to precipitate is Cd2+ .

Explanation / Answer

b) The molarity of AsO43- which begins to precipitate the initial cation is 2.82e-56 M

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