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O-14
5.
Potassium permanganate can be used to determine the K
sp
for an insoluble oxalate.
A solution, prepared by adding 20.00 mL of 0.07500 M AgNO3 to 40.00 mL of 0.02600 M
Na2C2O
4
. This solution is filtered (Ag2C2O
4(s)
), and the excess oxalate is acidified and then
titrated using 0.0105 M KMnO
4
. The equivalence point is reached after the addition of 11.22
mL of KMnO
4
. Determine the K
sp
of Ag2C2O
4(s)
. (Hint: set up an I.C.E. table and find the
equilibrium concentrations of Ag
+
and C2O
4
2-
). (1.5 marks)
ASSESSMENT
Performance
(1.0 mark):
Concentration of Unknown (Accuracy)
(1.0 mark):
Laboratory Report
(8.0 marks):
