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A quantitative analysis practice exam focused on calculating ph values during titrations, determining the amount of base required to reach a specific ph, and understanding complex ion equilibria. Topics include titration of cocaine with hno3, adding koh to oxalic acid, iminodiacetic acid titration with cu2+, and calculating free ca2+ concentrations in cay2- solutions. Students are required to use provided data and formulas to solve problems.
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1 _______ (of 10)
2 _______ (of 10)
3 _______ (of 10)
4 _______ (of 10)
5 _______ (of 10)
Name: ___________________________________________ (please print)
(last 4 digits)
N O OCH (^3)
O O
N O OCH 3
O O
H
H 2 N
CH 2 CO 2 H
CH 2 CO 2 H
H 3 X +
[X2-^ ] αX 2-= [H 3 X +^ ] + [H 2 X] + [HX-^ ] + [X2-]
Cu2+^ + 2X2-^ CuX 2 2-^ K = 3.5 x 10^16
A solution of volume 25.0 mL containing 0.120 M iminodiacetic acid buffered to pH 7.00 was titrated with 25.0 mL of 0.050 M Cu 2+. Given that αX2- = 4.6•10 -3^ at pH 7.00, calculate the concentration of Cu 2+^ in the resulting solution. (10 points)
free Ca 2+^ in a solution of 0.10 M CaY2-^ at pH 10.00 and at pH 6.00. You need to use the appropriate α 4 value for EDTA at 20ºC and μ = 0.10 M from the
