a) Solid nickel(II) acetate is slowly added to 150 mL of a 0.0539 M sodium hydro

Question

a)

Solid nickel(II) acetate is slowly added to 150 mL of a 0.0539 M sodium hydroxide solution. The concentration of nickel ion required to just initiate precipitation is _____M.

b)

Solid ammonium carbonate is slowly added to 175 mL of a 0.0460 M calcium acetate solution. The concentration of carbonate ion required to just initiate precipitation is _____M.

c)

Solid barium nitrate is slowly added to 150 mL of a 0.0462 M potassium phosphate solution. The concentration of barium ion required to just initiate precipitation is _____M.

Explanation / Answer

The Ksp of Ni(OH)2 = 6 X 10^-16

Ni(OH)2 --> Ni+2   + 2OH-

Ksp = [Ni+2] [OH-] 2

[OH-] = 0.0539

so [Ni+2] = 6 X 10^-16 / 0.0539

[Ni+2] = 1.11 X 10^-14 so we need this concentration for ppt

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