3. A solution contains 0.045 M Ca2+, 0.045 M Zn2+, and 0.045 M Ni²+ ions. a. If you separate them using aqueous (NH),C,O, which ion will precipitate first as an oxalate? Consider the K values for CaCO, ZnC₂O, and NICO, on page 86. sp

Chemistry: Principles and Practice
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Chapter14: Chemical Equilibrium
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Problem 14.83QE: Some barium chloride is added to a solution that contains both K2SO4 (0.050 M) and Na3PO4 (0.020 M)....
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3. A solution contains 0.045 M Ca2+, 0.045 M Zn2+, and 0.045 M Ni²+ ions.
a.
If you separate them using aqueous (NH),C,O, which ion will precipitate first as an
oxalate? Consider the K values for CaCO, ZnC₂O, and NiC₂O on page 86.
sp
4'
b. Calculate the concentration of the oxalate ion when the first cation (Ca2+, Zn2+, or
Ni²+) begins to precipitate.
Synthes of
Coo
on Compounds
C.
Explain why NiC2O4 and ZnC₂O4 do not actually precipitate with CaCO during
Procedure 8 of Qualitative Analysis scheme. (Hint: See the formation constants on
page 86.)
Transcribed Image Text:3. A solution contains 0.045 M Ca2+, 0.045 M Zn2+, and 0.045 M Ni²+ ions. a. If you separate them using aqueous (NH),C,O, which ion will precipitate first as an oxalate? Consider the K values for CaCO, ZnC₂O, and NiC₂O on page 86. sp 4' b. Calculate the concentration of the oxalate ion when the first cation (Ca2+, Zn2+, or Ni²+) begins to precipitate. Synthes of Coo on Compounds C. Explain why NiC2O4 and ZnC₂O4 do not actually precipitate with CaCO during Procedure 8 of Qualitative Analysis scheme. (Hint: See the formation constants on page 86.)
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