Consider a saturated solution of calcium oxalate, CaC2O4, in which the following equilibrium can occur: CaC2O4(s) = Ca²* (aq) + C20,²- (aq) Ksp = 1.3 x 10-8 C20,2- (aq) + H20 (1) = HC204 (aq) + OH- (aq) HC204 (aq) + H20 (1) 2 H2C204 (aq) + OH- (aq) If the pH is fixed at 2.30 (then charge balance becomes invalid), find the concentration of Ca2+ in the solution. Assume y =1 for all species. Къ 1.8 х 10-10 Kb2 = 1.8 x 10-13 | 0.090 M O 1.3 x 10-8 M | 99.1 ppm O1.14 x 10-3 M 1.8 x 10-6 M

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter16: Solubility And Precipitation Equilibria
Section: Chapter Questions
Problem 70AP
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Consider a saturated solution of calcium oxalate, CaC204, in which the following equilibrium can
occur:
CaC204(s) = Ca2* (aq) + C204²- (aq)
Ksp = 1.3 x 10-8
C20,2 (aq) + H2O (1) = HC204 (aq) + OH (aq)
HC204 (aq) + H20 (I) = H2C204 (aq) + OH- (aq)
If the pH is fixed at 2.30 (then charge balance becomes invalid), find the concentration of
Ca2+ in the solution. Assume y =1 for all species.
Къ1 1.8 х 10-10
K62 = 1.8 x 10-13
0.090 M
O 1.3 x 10-8 M
| 99.1 ppm
O 1.14 x 10-3 M
O 1.8 x 10-6 M
Transcribed Image Text:Consider a saturated solution of calcium oxalate, CaC204, in which the following equilibrium can occur: CaC204(s) = Ca2* (aq) + C204²- (aq) Ksp = 1.3 x 10-8 C20,2 (aq) + H2O (1) = HC204 (aq) + OH (aq) HC204 (aq) + H20 (I) = H2C204 (aq) + OH- (aq) If the pH is fixed at 2.30 (then charge balance becomes invalid), find the concentration of Ca2+ in the solution. Assume y =1 for all species. Къ1 1.8 х 10-10 K62 = 1.8 x 10-13 0.090 M O 1.3 x 10-8 M | 99.1 ppm O 1.14 x 10-3 M O 1.8 x 10-6 M
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