CHEMISTRY
316
CLASS PROBLEMS
For Fall Semester
M.
W. Rowe
Class problems 1:
(I) What will be the Pb2+ equilibrium molar concentration in a solution made by mixing 50.00 ml of 0.05000 M Pb(NO3)2 with 45.00 ml of 0.030000M KI?
(II)
The Ksp for La(IO3)3 is 6.2 X 10-12.
What is then [La3+] in a solution prepared by mixing 50.00 ml
of 0.05000 M La3+ with 50.00 ml of:
(a) water
(b) 0.0500 M IO3-
(c) 0.3000 M IO3-
Class problem 2
A
solution contains both La3+ ions (0.01500 M) and Ag+
ions (0.1000 M). Is it possible to separate La3+ from
Ag+ using IO3- ions? Assume that the criterion
for quantitative removal of an ion is 10-7 M. Use complete
sentences and plain English to expalin your logic.