 |
 |
2 of 11 |  |
 |
 |
V-2
(1.0)
2.
(Exp M) A standard solution of the [Fe(Bipy)3]
2+
complex was prepared by combining the
following reagents with 5.00 mL of a 5.31 x 10
-3
M iron(II) standard solution in a 100 mL
volumetric flask:
2.0 mL of 6.0 M H2SO
4
1.0 mL of 10 % hydroxylamine solution
5.0 mL of 5.0 % bipyridine solution
5.0 mL of 1.0 M sodium acetate solution
Distilled water was used to fill the flask to the 100.0 mL mark. What is the concentration
of the [Fe(Bipy)3]
2+
complex in the diluted solution?
a.
2.66 x 10
-5
M
b.
2.66 x 10
-4
M
c.
1.06 x 10
-3
M
d.
5.31 x 10
-3
M
e.
1.48 x 10
-2
M
(1.0)
3.
(Exp M) The absorbance of a 1.376 x 10
-3
M [Fe(NCS)]
2+
(iron(III) thiocyanate) solution
was found to be 0.632. If the percent transmittance (% T) of a [Fe(NCS)]
2+
solution of
unknown concentration in the same cuvette was 39.2%, the concentration of the complex
ion in the unknown solution would be:
a.
8.53 x 10
-4
M
b.
8.86 x 10
-4
M
c.
8.53 x 10
-2
M
d.
3.92 x 10
-1
M
e.
4.07 x 10
-1
M
