1) A solution contains 5.72×10-3 M manganese(II) nitrate and 6.51×10-3 M lead ac
ID: 552447 • Letter: 1
Question
1) A solution contains 5.72×10-3 M manganese(II) nitrate and 6.51×10-3 M lead acetate. Solid ammonium carbonate is added slowly to this mixture. What is the concentration of lead ion when manganese(II) ion begins to precipitate? [Pb2+] ____= M
2) A solution contains 9.10×10-3 M potassium hydroxide and 1.41×10-2 M potassium cyanide.
Solid zinc acetate is added slowly to this mixture.
What is the concentration of hydroxide ion when cyanide ion begins to precipitate?
[hydroxide] = ___M
*** I'm stuck on both, please help***
Explanation / Answer
1)
Ksp of MnCO3 = 2.24×10–11
Ksp of PbCO3 = 7.40×10–14
MnCO3 --------------> Mn+2 + CO32-
Ksp = [Mn+2][CO32-]
2.24×10–11 = (5.72 x 10^-3) [CO32-]
[CO32-] = 3.92 x 10^-9 M
PbCO3 ------------> Pb+2 + CO32-
Ksp = [Pb+2][CO32-]
7.40×10–14 = [Pb+2] (3.92 x 10^-9 )
[Pb+2] = 1.89 x 10^-5 M
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